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Show Seth/Gregorian astronomy columns and dual-date lunar event list

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Seth
2026-03-09 02:36:56 +00:00
parent 9bd245d870
commit 196cf7557f
2 changed files with 109 additions and 21 deletions
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astro.html
+38 -13
View File
@@ -35,16 +35,28 @@
color: var(--muted); color: var(--muted);
margin-top: 0.2rem; margin-top: 0.2rem;
} }
.astro-head {
display: grid;
grid-template-columns: 130px 1fr 1fr;
gap: 0.35rem 0.9rem;
font-size: 0.72rem;
color: #808892;
text-transform: uppercase;
letter-spacing: 0.05em;
margin-top: 0.35rem;
}
.astro-grid { .astro-grid {
display: grid; display: grid;
grid-template-columns: repeat(2, 1fr); grid-template-columns: 130px 1fr 1fr;
gap: 0.4rem 1rem; gap: 0.35rem 0.9rem;
font-size: 0.92rem; font-size: 0.9rem;
color: var(--muted); color: var(--muted);
margin: 1.2rem 0; margin: 0.45rem 0 1.1rem;
}
.astro-label {
color: var(--text);
font-weight: 600;
} }
.astro-grid p { margin: 0; }
.astro-grid strong { color: var(--text); }
.date-nav { .date-nav {
display: flex; display: flex;
align-items: center; align-items: center;
@@ -92,10 +104,19 @@
border-bottom: 1px solid #2a2a2a; border-bottom: 1px solid #2a2a2a;
display: flex; display: flex;
justify-content: space-between; justify-content: space-between;
align-items: flex-start;
gap: 0.5rem; gap: 0.5rem;
} }
.event-list li:last-child { border-bottom: none; } .event-list li:last-child { border-bottom: none; }
.event-name { color: var(--text); } .event-name { color: var(--text); }
.event-dual {
display: flex;
flex-direction: column;
text-align: right;
gap: 0.04rem;
font-size: 0.77rem;
}
.event-dual span:first-child { color: var(--text); }
</style> </style>
</head> </head>
<body> <body>
@@ -117,19 +138,23 @@
<div class="moon-pct" id="moonPct">—</div> <div class="moon-pct" id="moonPct">—</div>
</div> </div>
<div class="astro-head">
<div></div><div>Seth</div><div>Gregorian</div>
</div>
<div class="section-head">Sun</div> <div class="section-head">Sun</div>
<div class="astro-grid"> <div class="astro-grid">
<p><strong>Sunrise:</strong> <span id="sunrise">—</span></p> <div class="astro-label">Sunrise</div><div id="sunriseSeth">—</div><div id="sunriseGreg">—</div>
<p><strong>Sunset:</strong> <span id="sunset">—</span></p> <div class="astro-label">Sunset</div><div id="sunsetSeth">—</div><div id="sunsetGreg">—</div>
<p><strong>Day length:</strong> <span id="dayLen">—</span></p> <div class="astro-label">Day length</div><div id="dayLenSeth">—</div><div id="dayLenGreg">—</div>
<p><strong>Solar noon:</strong> <span id="solarNoon">—</span></p> <div class="astro-label">Solar noon</div><div id="solarNoonSeth">—</div><div id="solarNoonGreg">—</div>
</div> </div>
<div class="section-head">Moon</div> <div class="section-head">Moon</div>
<div class="astro-grid"> <div class="astro-grid">
<p><strong>Age:</strong> <span id="moonAge">—</span></p> <div class="astro-label">Age</div><div id="moonAgeSeth">—</div><div id="moonAgeGreg">—</div>
<p><strong>Next new moon:</strong> <span id="nextNew">—</span></p> <div class="astro-label">Next new moon</div><div id="nextNewSeth">—</div><div id="nextNewGreg">—</div>
<p><strong>Next full moon:</strong> <span id="nextFull">—</span></p> <div class="astro-label">Next full moon</div><div id="nextFullSeth">—</div><div id="nextFullGreg">—</div>
</div> </div>
<ul class="event-list" id="yearEvents" style="margin-top:1rem;"></ul> <ul class="event-list" id="yearEvents" style="margin-top:1rem;"></ul>
astro.js
+71 -8
View File
@@ -143,6 +143,54 @@ function dayLengthStr(riseJD, setJD) {
return `${h}h ${String(m).padStart(2,"0")}m`; return `${h}h ${String(m).padStart(2,"0")}m`;
} }
function jdToDecimalTime(jd) {
const frac = ((jd + 0.5) % 1 + 1) % 1;
const dec = frac * 10;
const h = Math.floor(dec);
const m = Math.floor((dec - h) * 100);
return `${h}:${String(m).padStart(2, "0")}`;
}
function dayLengthDecimalStr(riseJD, setJD) {
const decHours = (setJD - riseJD) * 10;
const h = Math.floor(decHours);
const m = Math.floor((decHours - h) * 100);
return `${h}:${String(m).padStart(2, "0")}`;
}
// ── Seth date helpers ───────────────────────────────────────────────────────
function isLeapYear(year) {
return (year % 4 === 0 && year % 100 !== 0) || year % 400 === 0;
}
function getDayOfYearUTC(date) {
const y = date.getUTCFullYear();
const m = date.getUTCMonth() + 1;
const d = date.getUTCDate();
const cum = [0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334];
let doy = cum[m - 1] + d;
if (isLeapYear(y) && m > 2) doy++;
return { year: y, doy };
}
function toSethDate(year, dayOfYear) {
const leap = isLeapYear(year);
if (leap && dayOfYear === 60) return { type: "leapday", year };
const idx = (leap && dayOfYear > 60 ? dayOfYear - 1 : dayOfYear) - 1;
if (idx < 360) {
const month = Math.floor(idx / 36);
const dayInM = idx % 36;
return { type: "month", year, month, day: dayInM };
}
return { type: "holiday", year, holiday: idx - 360 };
}
function sethLog(sd) {
if (sd.type === "leapday") return `Leap Day ${sd.year}`;
if (sd.type === "holiday") return `H${sd.holiday}.${sd.year}`;
return `${String(sd.day).padStart(2, "0")}.${sd.month}.${sd.year}`;
}
// ── Solstice / Equinox (Meeus Table 27.a + correction) ─────────────────────── // ── Solstice / Equinox (Meeus Table 27.a + correction) ───────────────────────
// Returns approximate JD for each event in a given year // Returns approximate JD for each event in a given year
// season: 0=March equinox, 1=June solstice, 2=September equinox, 3=December solstice // season: 0=March equinox, 1=June solstice, 2=September equinox, 3=December solstice
@@ -246,15 +294,27 @@ function render() {
const jd = jdFromDate(date); const jd = jdFromDate(date);
const nextNewJD = nextMoonPhaseJD(jd, 0); const nextNewJD = nextMoonPhaseJD(jd, 0);
const nextFullJD = nextMoonPhaseJD(jd, 2); const nextFullJD = nextMoonPhaseJD(jd, 2);
document.getElementById("nextNew").textContent = dateFromJD(nextNewJD).toLocaleDateString("en-US", { month: "short", day: "numeric", timeZone: "UTC" }); const nextNewDate = dateFromJD(nextNewJD);
document.getElementById("nextFull").textContent = dateFromJD(nextFullJD).toLocaleDateString("en-US", { month: "short", day: "numeric", timeZone: "UTC" }); const nextFullDate = dateFromJD(nextFullJD);
const nextNewSeth = toSethDate(getDayOfYearUTC(nextNewDate).year, getDayOfYearUTC(nextNewDate).doy);
const nextFullSeth = toSethDate(getDayOfYearUTC(nextFullDate).year, getDayOfYearUTC(nextFullDate).doy);
document.getElementById("nextNewSeth").textContent = sethLog(nextNewSeth);
document.getElementById("nextNewGreg").textContent = nextNewDate.toLocaleDateString("en-US", { month: "short", day: "numeric", year: "numeric", timeZone: "UTC" });
document.getElementById("nextFullSeth").textContent = sethLog(nextFullSeth);
document.getElementById("nextFullGreg").textContent = nextFullDate.toLocaleDateString("en-US", { month: "short", day: "numeric", year: "numeric", timeZone: "UTC" });
// Sun // Sun
const sun = sunriseSunset(date, LAT, LON); const sun = sunriseSunset(date, LAT, LON);
document.getElementById("sunrise").textContent = sun.rise || (sun.alwaysUp ? "Midnight sun" : "Below horizon"); document.getElementById("sunriseSeth").textContent = sun.riseJD ? jdToDecimalTime(sun.riseJD) : "—";
document.getElementById("sunset").textContent = sun.set || (sun.alwaysUp ? "Midnight sun" : "Below horizon"); document.getElementById("sunriseGreg").textContent = sun.rise || (sun.alwaysUp ? "Midnight sun" : "Below horizon");
document.getElementById("solarNoon").textContent = sun.noon; document.getElementById("sunsetSeth").textContent = sun.setJD ? jdToDecimalTime(sun.setJD) : "—";
document.getElementById("dayLen").textContent = sun.rise && sun.set ? dayLengthStr(sun.riseJD, sun.setJD) : "—"; document.getElementById("sunsetGreg").textContent = sun.set || (sun.alwaysUp ? "Midnight sun" : "Below horizon");
document.getElementById("solarNoonSeth").textContent = sun.noonJD ? jdToDecimalTime(sun.noonJD) : "—";
document.getElementById("solarNoonGreg").textContent = sun.noon;
document.getElementById("dayLenSeth").textContent = sun.rise && sun.set ? dayLengthDecimalStr(sun.riseJD, sun.setJD) : "—";
document.getElementById("dayLenGreg").textContent = sun.rise && sun.set ? dayLengthStr(sun.riseJD, sun.setJD) : "—";
document.getElementById("moonAgeSeth").textContent = `${(age * (10 / 29.53058867)).toFixed(2)} days`;
document.getElementById("moonAgeGreg").textContent = `${age.toFixed(1)} days`;
@@ -290,9 +350,12 @@ function render() {
ul.innerHTML = ""; ul.innerHTML = "";
allEvents.forEach(ev => { allEvents.forEach(ev => {
const li = document.createElement("li"); const li = document.createElement("li");
const ds = ev.date.toLocaleDateString("en-US", { month: "short", day: "numeric", timeZone: "UTC" }); const ds = ev.date.toLocaleDateString("en-US", { month: "short", day: "numeric", year: "numeric", timeZone: "UTC" });
const sy = getDayOfYearUTC(ev.date);
const sseth = toSethDate(sy.year, sy.doy);
const sds = sethLog(sseth);
const isToday = dateToParam(ev.date) === dateToParam(date); const isToday = dateToParam(ev.date) === dateToParam(date);
li.innerHTML = `<span class="event-name"${isToday ? ' style="color:var(--accent)"' : ""}>${ev.name}</span><span>${ds}</span>`; li.innerHTML = `<span class="event-name"${isToday ? ' style="color:var(--accent)"' : ""}>${ev.name}</span><span class="event-dual"><span>${sds}</span><span>${ds}</span></span>`;
ul.appendChild(li); ul.appendChild(li);
}); });
} }