തീയതി, സമയം, സ്ഥലം എന്നിവയെ അടിസ്ഥാനമാക്കി കാണാവുന്ന നക്ഷത്രമാലകൾ കാണിക്കുന്ന ഇന്ററാക്ടീവ് SVG രാത്രി ആകാശം മാപ്പ് സൃഷ്ടിക്കുക. സ്വയമേവ കണ്ടെത്തൽ അല്ലെങ്കിൽ മാനുവൽ കോഓർഡിനേറ്റ് ഇൻപുട്ട്, നക്ഷത്രമാലയുടെ പേരുകൾ, നക്ഷത്രങ്ങളുടെ സ്ഥാനം, ആകാശരേഖ എന്നിവയുടെ ഫീച്ചറുകൾ.
The Constellation Viewer App is a powerful tool for astronomy enthusiasts and stargazers. It allows users to visualize the night sky and identify visible constellations based on their location, date, and time. This interactive application provides a simple SVG night sky map, displaying constellation names, basic star positions, and a horizon line, all within a single-page interface.
The app uses a combination of celestial coordinates and time calculations to determine which constellations are visible in the night sky:
Right Ascension (RA) and Declination (Dec): These are the celestial equivalents of longitude and latitude, respectively. RA is measured in hours (0 to 24), and Dec is measured in degrees (-90° to +90°).
Local Sidereal Time (LST): This is calculated using the observer's longitude and the current date and time. LST determines which part of the celestial sphere is currently overhead.
Hour Angle (HA): This is the angular distance between the meridian and a celestial object, calculated as:
Altitude (Alt) and Azimuth (Az): These are calculated using the following formulas:
Where Lat is the observer's latitude.
The app performs the following steps to determine visible constellations and render the sky map:
The Constellation Viewer App has various applications:
While our Constellation Viewer App provides a simple and accessible way to view the night sky, there are other tools available:
The history of constellation mapping and star charts dates back thousands of years:
The app uses a simplified constellation database stored in a TypeScript file:
1export interface Star {
2 ra: number; // Right Ascension in hours
3 dec: number; // Declination in degrees
4 magnitude: number; // Star brightness
5}
6
7export interface Constellation {
8 name: string;
9 stars: Star[];
10}
11
12export const constellations: Constellation[] = [
13 {
14 name: "Ursa Major",
15 stars: [
16 { ra: 11.062, dec: 61.751, magnitude: 1.79 },
17 { ra: 10.229, dec: 60.718, magnitude: 2.37 },
18 // ... more stars
19 ]
20 },
21 // ... more constellations
22];
23This data structure allows for efficient lookup and rendering of constellations.
The app uses D3.js to create the SVG night sky map. Here's a simplified example of the rendering process:
1import * as d3 from 'd3';
2
3function renderSkyMap(visibleConstellations, width, height) {
4 const svg = d3.create("svg")
5 .attr("width", width)
6 .attr("height", height)
7 .attr("viewBox", [0, 0, width, height]);
8
9 // Draw sky background
10 svg.append("circle")
11 .attr("cx", width / 2)
12 .attr("cy", height / 2)
13 .attr("r", Math.min(width, height) / 2)
14 .attr("fill", "navy");
15
16 // Draw stars and constellations
17 visibleConstellations.forEach(constellation => {
18 const lineGenerator = d3.line()
19 .x(d => projectStar(d).x)
20 .y(d => projectStar(d).y);
21
22 svg.append("path")
23 .attr("d", lineGenerator(constellation.stars))
24 .attr("stroke", "white")
25 .attr("fill", "none");
26
27 constellation.stars.forEach(star => {
28 const { x, y } = projectStar(star);
29 svg.append("circle")
30 .attr("cx", x)
31 .attr("cy", y)
32 .attr("r", 5 - star.magnitude)
33 .attr("fill", "white");
34 });
35
36 // Add constellation name
37 const firstStar = projectStar(constellation.stars[0]);
38 svg.append("text")
39 .attr("x", firstStar.x)
40 .attr("y", firstStar.y - 10)
41 .text(constellation.name)
42 .attr("fill", "white")
43 .attr("font-size", "12px");
44 });
45
46 // Draw horizon line
47 svg.append("line")
48 .attr("x1", 0)
49 .attr("y1", height / 2)
50 .attr("x2", width)
51 .attr("y2", height / 2)
52 .attr("stroke", "green")
53 .attr("stroke-width", 2);
54
55 return svg.node();
56}
57
58function projectStar(star) {
59 // Convert RA and Dec to x, y coordinates
60 // This is a simplified projection and should be replaced with a proper celestial projection
61 const x = (star.ra / 24) * width;
62 const y = ((90 - star.dec) / 180) * height;
63 return { x, y };
64}
65The app handles different time zones and locations by:
While the app doesn't directly account for light pollution, users should be aware that:
The horizon line is calculated based on the observer's location:
The app accounts for seasonal variations in visible constellations by:
നിങ്ങളുടെ പ്രവർത്തനത്തിന് ഉപയോഗപ്പെടുന്ന കൂടുതൽ ഉപകരണങ്ങൾ കണ്ടെത്തുക.