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Live PRT dot map of Earth with every ortus unit
Static page: day/night lit dot map, PRT in ms/s/m/h/d/w, PRT day and week progress, milestones, next equinox/solstice, Date <-> PRT converter. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Claude Opus 5.5
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import { PRT } from 'ortus'
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import { R, LAND } from './land.js'
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const $ = s => document.getElementById(s)
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const { sin, cos, asin, atan2, max, min, floor, abs, PI } = Math
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const D = PI / 180, TAU = 2 * PI
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const E = PRT.toUnixMs(0)
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const UNITS = { ms: 'milliseconds', s: 'seconds', m: 'minutes', h: 'hours', d: 'days', w: 'weeks' }
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const nf = new Intl.NumberFormat('en-US')
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const num = n => nf.format(n).replace(/,/g, '<i>,</i>')
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const pad = n => String(n).padStart(2, '0')
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const dur = t => {
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const s = floor(t / 1e3), d = floor(s / 86400)
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return (d ? d + 'd ' : '') + [floor(s / 3600) % 24, floor(s / 60) % 60, s % 60].map(pad).join(':')
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}
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const SHORT = { year: 'numeric', month: 'short', day: 'numeric', hour: '2-digit', minute: '2-digit' }
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const LONG = { ...SHORT, second: '2-digit', timeZoneName: 'short' }
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const loc = (t, o = SHORT) => new Date(t).toLocaleString(undefined, o)
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const iso = t => new Date(t).toISOString().replace('T', ' ').slice(0, 19) + ' UTC'
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const set = (id, h) => { const e = $(id); e.innerHTML != h && (e.innerHTML = h) }
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const ll = (v, p, n) => abs(v).toFixed(1) + '°' + (v < 0 ? n : p)
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// Low-precision solar ephemeris (~0.01°): declination + subsolar longitude, radians
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const sun = t => {
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const d = t / 864e5 - 10957.5, g = (357.529 + .98560028 * d) * D, q = 280.459 + .98564736 * d
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const L = (q + 1.915 * sin(g) + .02 * sin(2 * g)) * D, e = (23.439 - 3.6e-7 * d) * D
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const ra = atan2(cos(e) * sin(L), cos(L)), gmst = (280.46061837 + 360.98564736629 * d) * D
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return { dec: asin(sin(e) * sin(L)), lon: (((ra - gmst) % TAU) + 3 * PI) % TAU - PI, L: ((L / D) % 360 + 360) % 360 }
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}
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// Next equinox/solstice: Newton-step the ecliptic longitude onto the next multiple of 90°
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const SEASONS = ['March equinox', 'June solstice', 'September equinox', 'December solstice']
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const season = now => {
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const q = floor(sun(now).L / 90 + 1e-9) + 1, g = q * 90 % 360
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let t = now
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for (let i = 0; i < 6; i++) t += (((g - sun(t).L) % 360 + 540) % 360 - 180 || 0) / .98565 * 864e5
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t < now && (t += 365.2422 * 864e5 / 4)
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return [SEASONS[q % 4], t]
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}
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const alt = (lat, lon, s) => asin(sin(lat) * sin(s.dec) + cos(lat) * cos(s.dec) * cos(lon - s.lon))
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// Land mask: RLE rows, 90N → 90S
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const mask = LAND.split(' ').map(r => {
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const a = new Uint8Array(360 * R)
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let i = 0, v = 0
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for (const n of r.split('.')) a.fill(v, i, i += parseInt(n, 36)), v ^= 1
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return a
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})
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const isLand = (lat, lon) => mask[min(180 * R - 1, max(0, floor((90 - lat) * R)))][floor((lon + 180) * R) % (360 * R)]
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// Map
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const LAT0 = 84, LAT1 = -58, NL = 16
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const cv = $('map'), cx = cv.getContext('2d'), sunEl = $('sun'), tip = $('tip')
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let W, H, dpr, dots = [], P
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const mix = (a, b, t) => a.map((v, i) => v + (b[i] - v) * t)
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const ramp = (st, t) => {
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const i = min(st.length - 2, floor(t * (st.length - 1)))
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return mix(st[i], st[i + 1], t * (st.length - 1) - i)
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}
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const rgba = c => `rgba(${c[0] | 0},${c[1] | 0},${c[2] | 0},${c[3].toFixed(3)})`
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const LANDC = [[34, 66, 160, .62], [44, 96, 215, .8], [70, 150, 255, .92], [150, 222, 255, 1]]
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const SEAC = [[30, 60, 150, .1], [60, 130, 255, .2]]
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const COL = [...Array(NL)].map((_, i) => rgba(ramp(SEAC, i / (NL - 1)))).concat([...Array(NL)].map((_, i) => rgba(ramp(LANDC, i / (NL - 1)))))
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const smooth = (a, b, x) => (x = min(1, max(0, (x - a) / (b - a))), x * x * (3 - 2 * x))
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const layout = () => {
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W = cv.clientWidth, H = cv.clientHeight, dpr = min(devicePixelRatio || 1, 2)
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cv.width = W * dpr, cv.height = H * dpr
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P = max(4.2, W / 200)
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const rh = P * .866
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dots = []
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for (let j = 0, y = rh / 2; y < H; y += rh, j++)
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for (let x = j & 1 ? P : P / 2; x < W; x += P) {
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const lat = LAT0 - y / H * (LAT0 - LAT1), lon = x / W * 360 - 180
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dots.push({ x, y, s: sin(lat * D), c: cos(lat * D), l: lon * D, k: isLand(lat, lon) })
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}
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draw()
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}
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const draw = () => {
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const s = sun(Date.now()), sd = sin(s.dec), cd = cos(s.dec)
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const sx = (s.lon / D + 180) / 360 * W, sy = (LAT0 - s.dec / D) / (LAT0 - LAT1) * H
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cx.setTransform(dpr, 0, 0, dpr, 0, 0)
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cx.clearRect(0, 0, W, H)
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for (const o of [-W, 0, W]) {
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const g = cx.createRadialGradient(sx + o, sy, 0, sx + o, sy, W * .32)
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g.addColorStop(0, 'rgba(60,140,255,.22)'), g.addColorStop(1, 'rgba(60,140,255,0)')
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cx.fillStyle = g, cx.fillRect(0, 0, W, H)
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}
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const B = [...Array(2 * NL)].map(() => new Path2D())
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for (const d of dots) {
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const a = d.s * sd + d.c * cd * cos(d.l - s.lon)
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const t = smooth(-.31, .1, a) * .7 + max(a, 0) * .3
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const b = d.k * NL + min(NL - 1, floor(t * NL)), r = d.k ? P * (.27 + .11 * t) : P * .2
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B[b].moveTo(d.x + r, d.y), B[b].arc(d.x, d.y, r, 0, TAU)
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}
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B.forEach((p, i) => (cx.fillStyle = COL[i], cx.fill(p)))
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sunEl.style.left = sx / W * 100 + '%', sunEl.style.top = sy / H * 100 + '%'
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}
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cv.addEventListener('pointermove', e => {
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const r = cv.getBoundingClientRect(), x = (e.clientX - r.left) / r.width, y = (e.clientY - r.top) / r.height
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const lat = LAT0 - y * (LAT0 - LAT1), lon = x * 360 - 180, s = sun(Date.now())
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const a = alt(lat * D, lon * D, s) / D, st = ((12 + (lon - s.lon / D) / 15) % 24 + 24) % 24
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tip.hidden = false
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tip.style.left = x * 100 + '%', tip.style.top = y * 100 + '%'
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tip.classList.toggle('l', x > .7)
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tip.innerHTML = `<b>${ll(lat, 'N', 'S')} ${ll(lon, 'E', 'W')}</b>${a > 0 ? 'sun ' + a.toFixed(0) + '° up' : a > -18 ? 'twilight' : 'night'} · solar ${pad(floor(st))}:${pad(floor(st % 1 * 60))}`
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})
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cv.addEventListener('pointerleave', () => tip.hidden = true)
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new ResizeObserver(layout).observe(cv)
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setInterval(draw, 5e3)
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// Unit cards
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const KS = Object.keys(UNITS).slice(1)
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$('units').innerHTML = KS.map(u => `<button class="unit" data-u="${u}"><span class="ul">${UNITS[u]}<em>${u}</em></span><span class="uv" id="v${u}">–</span><span class="bar"><i id="b${u}"></i></span><span class="un" id="n${u}"></span></button>`).join('')
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const last = {}
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const toast = m => { const t = $('toast'); t.textContent = m, t.hidden = false, clearTimeout(toast.t), toast.t = setTimeout(() => t.hidden = true, 1400) }
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const copy = v => navigator.clipboard?.writeText(String(v)).then(() => toast('Copied ' + nf.format(v)))
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document.addEventListener('click', e => {
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const u = e.target.closest('[data-u]')?.dataset.u
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u && copy(PRT.now(u))
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})
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$('ms').addEventListener('click', () => copy(PRT.now()))
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$('npm').addEventListener('click', () => navigator.clipboard?.writeText('npm i ortus').then(() => toast('Copied npm i ortus')))
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// Static bits
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$('ep').textContent = `A Saturday · ${loc(E, LONG)} local`
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$('pips').innerHTML = '<i></i>'.repeat(7)
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const pips = [...$('pips').children]
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// Milestones: next round number per unit (2 significant digits), plus the trillion
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const miles = now => {
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const m = new Map(), add = (u, n) => {
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const t = PRT.toUnixMs(n, u)
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t > now && m.set(t, [...(m.get(t) || []), `${num(n)} <em>${u}</em>`])
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}
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for (const u in UNITS) {
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const v = PRT.fromUnixMs(now, u), k = 10 ** max(1, floor(Math.log10(abs(v) || 1)) - 1)
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add(u, (floor(v / k) + 1) * k)
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}
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add('ms', 1e12), add('s', 1e9), add('d', 11111)
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return [...m].sort((a, b) => a[0] - b[0]).slice(0, 6)
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}
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const age = now => {
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const at = (y, mo) => { const d = new Date(E); d.setUTCFullYear(d.getUTCFullYear() + y, d.getUTCMonth() + mo); return +d }
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let y = 0, mo = 0
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while (at(y + 1, 0) <= now) y++
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while (at(y, mo + 1) <= now) mo++
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const r = now - at(y, mo)
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return `${y}y ${mo}mo ${floor(r / 864e5)}d ${dur(r % 864e5)}`
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}
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const slow = now => {
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set('utc', iso(now))
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set('loc', loc(now, LONG))
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set('age', age(now))
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set('unix', `Unix ${num(floor(now / 1e3))} s · epoch ${num(E)} ms`)
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const d = PRT.fromUnixMs(now, 'd'), d0 = PRT.toUnixMs(d, 'd'), d1 = PRT.toUnixMs(d + 1, 'd')
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set('day', `#${num(d)}`)
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$('dayb').style.transform = `scaleX(${(now - d0) / (d1 - d0)})`
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set('daym', `began ${loc(d0, { hour: '2-digit', minute: '2-digit' })} · ends in ${dur(d1 - now)}`)
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const w = PRT.fromUnixMs(now, 'w'), wd = ((d % 7) + 7) % 7
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set('wk', `#${num(w)} · day ${wd + 1}/7`)
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set('wkm', `Weeks start Saturday 03:00 UTC · next in ${dur(PRT.toUnixMs(w + 1, 'w') - now)}`)
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pips.forEach((p, i) => p.className = i < wd ? 'on' : i == wd ? 'cur' : '')
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const s = sun(now)
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set('ss', `${ll(s.dec / D, 'N', 'S')} ${ll(s.lon / D, 'E', 'W')}`)
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const [sn, st] = season(now)
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set('ssm', `Subsolar point · declination ${(s.dec / D).toFixed(2)}°<br>${sn} ≈ ${loc(st)} · in ${dur(st - now)}`)
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set('miles', miles(now).map(([t, l]) => `<li><span class="mv">${l.join(' <s>=</s> ')}</span><span class="mt">${loc(t)}</span><span class="mc">in ${dur(t - now)}</span></li>`).join(''))
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}
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// Main loop
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let sec
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const tick = () => {
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const now = Date.now()
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const ms = PRT.fromUnixMs(now)
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last.ms != ms && ($('ms').innerHTML = num(last.ms = ms))
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for (const u of KS) {
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const v = PRT.fromUnixMs(now, u), a = PRT.toUnixMs(v, u), b = PRT.toUnixMs(v + 1, u)
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last[u] != v && ($('v' + u).innerHTML = num(last[u] = v))
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$('b' + u).style.transform = `scaleX(${(now - a) / (b - a)})`
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set('n' + u, u == 's' ? `next in ${((b - now) / 1e3).toFixed(1)}s` : `next in ${dur(b - now)}`)
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}
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floor(now / 1e3) != sec && slow(now, sec = floor(now / 1e3))
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requestAnimationFrame(tick)
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}
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tick()
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// Converter
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$('pu').innerHTML = Object.entries(UNITS).map(([u, n]) => `<option value="${u}">${n}</option>`).join('')
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const dl = rows => rows.map(([k, v]) => `<dt>${k}</dt><dd>${v}</dd>`).join('')
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const err = e => `<dt>!</dt><dd class="err">${e.message}</dd>`
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const toLocalInput = t => { const d = new Date(t - new Date(t).getTimezoneOffset() * 6e4); return d.toISOString().slice(0, 23) }
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const conv = () => {
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const v = $('cin').value
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if (!v) return $('cout').innerHTML = ''
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try {
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const dt = new Date(v + ($('cz').checked ? 'Z' : ''))
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$('cout').innerHTML = dl(Object.keys(UNITS).map(u => [u, num(PRT.fromDate(dt, u))]))
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} catch (e) { $('cout').innerHTML = err(e) }
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}
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const pconv = () => {
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try {
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const n = Number($('pin').value.replace(/[\s,_]/g, '')), t = PRT.toUnixMs(n, $('pu').value)
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$('pout').innerHTML = dl([['UTC', iso(t)], ['local', loc(t, LONG)], ['day', new Date(t).toLocaleDateString(undefined, { weekday: 'long' })], ['unix', num(t) + ' ms']])
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} catch (e) { $('pout').innerHTML = err(e) }
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}
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const fill = () => $('cin').value = $('cz').checked ? new Date().toISOString().slice(0, 23) : toLocalInput(Date.now())
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$('cnow').onclick = () => (fill(), conv())
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$('cz').onchange = () => (fill(), conv())
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$('cin').oninput = conv
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$('pin').oninput = $('pu').onchange = pconv
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fill(), conv(), pconv()
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