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southern-hemisphere-summer.html
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southern-hemisphere-summer.html
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<!DOCTYPE html>
<!-- source: http://bl.ocks.org/mbostock/4597134 -->
<meta charset="utf-8">
<style>
.stroke {
fill: none;
stroke: #000;
stroke-width: 0;
}
.fill {
fill: #1795d1;
}
.graticule {
fill: none;
stroke: #ccc;
stroke-width: 1px;
stroke-opacity: 0.5;
}
.land {
fill: #fff ;
}
.boundary {
fill: none;
stroke: #fff;
stroke-width: 0;
}
.route {
fill: none;
stroke: rgba(0,0,0,.5);
stroke-width: 2px;
}
.point {
fill: none;
stroke: #000;
stroke-width: 10px;
}
.night {
/*stroke: steelblue;*/
fill: black;
fill-opacity: .5;
}
.day {
/*stroke: yellow;*/
fill: transparent;
fill-opacity: .3;
}
.city {
fill: black;
stroke: #000;
stroke-width: 1px;
}
.sun {
fill: orange;
stroke: orange;
stroke-width: 1px;
}
</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script src="//d3js.org/topojson.v1.min.js"></script>
<script>
var width = 960,
height = 960;
var π = Math.PI,
radians = π / 180,
degrees = 180 / π;
// var projection = d3.geo.equirectangular()
// .translate([width / 2, height / 2])
// .scale(153)
// .precision(.1);
var projection = d3.geo.azimuthalEquidistant()
.scale(100)
.translate([width / 2, height / 2])
.rotate([0,-90])
.clipAngle(180 - 1e-3)
.precision(0.1);
// var projection = d3.geo.orthographic()
// .rotate([0, 90])
// .scale(250)
// .translate([width / 2, height / 2])
// .clipAngle(90);
var circlenight = d3.geo.circle()
.angle(90);
var circleday = d3.geo.circle()
.angle(90);
var path = d3.geo.path()
.projection(projection);
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
svg.append("defs").append("path")
.datum({type: "Sphere"})
.attr("id", "sphere")
.attr("d", path);
svg.append("use")
.attr("class", "stroke")
.attr("xlink:href", "#sphere");
svg.append("use")
.attr("class", "fill")
.attr("xlink:href", "#sphere");
svg.append("path")
.datum(function() {
return d3.geo.graticule()
// .stepMinor([30,30])
// .extentMinor([[-180,-90], [180,90]])
();
})
.attr("class", "graticule")
.attr("d", path);
function getPoint(i) {
return {
"type": "FeatureCollection",
"features": [
{
"type": "Feature",
"geometry": {
"type": "Point",
"coordinates": i
}
}
]
};
}
d3.json("common/50m.json", function(error, world) {
if (error) throw error;
svg.append("path")
.datum(topojson.feature(world, world.objects.land))
.attr("class", "land")
.attr("d", path);
var night = svg.append("path")
.attr("class", "night")
.attr("d", path);
var day = svg.append("path")
.attr("class", "day")
.attr("d", path);
redraw();
// setInterval(redraw, 1000);
function redraw() {
// var date = new Date(2018, 12, 22, 0, 40); // capetown-auckland
// var date = new Date(2018, 12, 22, 4, 45); // saopaulo-perth
// var date = new Date(2018, 12, 22, 16, 0); // melbourne-buenos-aires-punta-arenas
// var date = new Date("December 21, 2018 16:53:30 UTC"); // wellington, christchurch, johannesburg, capetown
// var date = new Date("December 21, 2018 17:05 UTC"); // wellington, christchurch, johannesburg, capetown
// var date = new Date("December 21, 2018 21:30 UTC"); // saopaulo-perth
// var date = new Date("December 22, 2018 08:50 UTC"); // melbourne-buenos-aires-punta-arenas
// var date = new Date("December 22, 2018 09:45 UTC"); // melbourne-buenos-aires-punta-arenas
var date = new Date("December 22, 2018 08:22 UTC"); // punta arenas - dunedin
// var date = new Date(2018, 12, 22, 15, 25); // melbourne-buenos-aires-punta-arenas
var solarposition = solarPosition(date);
// day.datum(circleday.origin((solarposition))).attr("d", path);
night.datum(circlenight.origin(antipode(solarposition))).attr("d", path);
svg.insert("path", ".sun")
.datum(getPoint(solarposition))
.attr("class", "sun")
.attr("d", path);
}
d3.json("common/locations.json", function(error, l) {
if (error) throw error;
svg.insert("path", ".city")
.datum(getPoint(l.auckland))
.attr("class", "city")
.attr("d", path);
svg.insert("path", ".city")
.datum(getPoint(l.johannesburg))
.attr("class", "city")
.attr("d", path);
svg.insert("path", ".city")
.datum(getPoint(l.buenosaires))
.attr("class", "city")
.attr("d", path);
svg.insert("path", ".city")
.datum(getPoint(l.sydney))
.attr("class", "city")
.attr("d", path);
svg.insert("path", ".city")
.datum(getPoint(l.perth))
.attr("class", "city")
.attr("d", path);
svg.insert("path", ".city")
.datum(getPoint(l.santiago))
.attr("class", "city")
.attr("d", path);
svg.insert("path", ".city")
.datum(getPoint(l.saopaulo))
.attr("class", "city")
.attr("d", path);
svg.insert("path", ".city")
.datum(getPoint(l.capetown))
.attr("class", "city")
.attr("d", path);
svg.insert("path", ".city")
.datum(getPoint(l.christchurch))
.attr("class", "city")
.attr("d", path);
svg.insert("path", ".city")
.datum(getPoint(l.puntaarenas))
.attr("class", "city")
.attr("d", path);
svg.insert("path", ".city")
.datum(getPoint(l.melbourne))
.attr("class", "city")
.attr("d", path);
svg.insert("path", ".city")
.datum(getPoint(l.adelaide))
.attr("class", "city")
.attr("d", path);
svg.insert("path", ".city")
.datum(getPoint(l.wellington))
.attr("class", "city")
.attr("d", path);
svg.insert("path", ".city")
.datum(getPoint(l.bloemfontein))
.attr("class", "city")
.attr("d", path);
svg.insert("path", ".city")
.datum(getPoint(l.dunedin))
.attr("class", "city")
.attr("d", path);
});
});
d3.select(self.frameElement).style("height", height + "px");
function antipode(position) {
return [position[0] + 180, -position[1]];
}
function solarPosition(time) {
var centuries = (time - Date.UTC(2000, 0, 1, 12)) / 864e5 / 36525, // since J2000
longitude = (d3.time.day.utc.floor(time) - time) / 864e5 * 360 - 180;
return [
longitude - equationOfTime(centuries) * degrees,
solarDeclination(centuries) * degrees
];
}
// Equations based on NOAA’s Solar Calculator; all angles in radians.
// http://www.esrl.noaa.gov/gmd/grad/solcalc/
function equationOfTime(centuries) {
var e = eccentricityEarthOrbit(centuries),
m = solarGeometricMeanAnomaly(centuries),
l = solarGeometricMeanLongitude(centuries),
y = Math.tan(obliquityCorrection(centuries) / 2);
y *= y;
return y * Math.sin(2 * l)
- 2 * e * Math.sin(m)
+ 4 * e * y * Math.sin(m) * Math.cos(2 * l)
- 0.5 * y * y * Math.sin(4 * l)
- 1.25 * e * e * Math.sin(2 * m);
}
function solarDeclination(centuries) {
return Math.asin(Math.sin(obliquityCorrection(centuries)) * Math.sin(solarApparentLongitude(centuries)));
}
function solarApparentLongitude(centuries) {
return solarTrueLongitude(centuries) - (0.00569 + 0.00478 * Math.sin((125.04 - 1934.136 * centuries) * radians)) * radians;
}
function solarTrueLongitude(centuries) {
return solarGeometricMeanLongitude(centuries) + solarEquationOfCenter(centuries);
}
function solarGeometricMeanAnomaly(centuries) {
return (357.52911 + centuries * (35999.05029 - 0.0001537 * centuries)) * radians;
}
function solarGeometricMeanLongitude(centuries) {
var l = (280.46646 + centuries * (36000.76983 + centuries * 0.0003032)) % 360;
return (l < 0 ? l + 360 : l) / 180 * π;
}
function solarEquationOfCenter(centuries) {
var m = solarGeometricMeanAnomaly(centuries);
return (Math.sin(m) * (1.914602 - centuries * (0.004817 + 0.000014 * centuries))
+ Math.sin(m + m) * (0.019993 - 0.000101 * centuries)
+ Math.sin(m + m + m) * 0.000289) * radians;
}
function obliquityCorrection(centuries) {
return meanObliquityOfEcliptic(centuries) + 0.00256 * Math.cos((125.04 - 1934.136 * centuries) * radians) * radians;
}
function meanObliquityOfEcliptic(centuries) {
return (23 + (26 + (21.448 - centuries * (46.8150 + centuries * (0.00059 - centuries * 0.001813))) / 60) / 60) * radians;
}
function eccentricityEarthOrbit(centuries) {
return 0.016708634 - centuries * (0.000042037 + 0.0000001267 * centuries);
}
</script>