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3c6b569cd4
I had to require('./astronomy.js') instead of require('astronomy.js')
to get the nodejs demos working, now that I maintain a redundant
copy of astronomy.js in the demo directories.
41 lines
1.2 KiB
JavaScript
41 lines
1.2 KiB
JavaScript
/*
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seasons.js - by Don Cross - 2019-06-16
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Example Node.js program for Astronomy Engine:
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https://github.com/cosinekitty/astronomy
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This program calculates the time of the next
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sunrise, sunset, moonrise, and moonset.
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To execute, run the command:
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node riseset latitude longitude [date]
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*/
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const Astronomy = require('./astronomy.js');
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function DisplayEvent(name, evt) {
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let text = evt ? evt.date.toISOString() : '';
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console.log(name.padEnd(17) + ' : ' + text);
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}
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function Demo() {
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if (process.argv.length === 3) {
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let year = parseInt(process.argv[2]);
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if (!Number.isSafeInteger(year)) {
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console.log(`ERROR: Not a valid year: "${process.argv[2]}"`);
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process.exit(1);
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}
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let seasons = Astronomy.Seasons(year);
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DisplayEvent('March equinox', seasons.mar_equinox);
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DisplayEvent('June solstice', seasons.jun_solstice);
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DisplayEvent('September equinox', seasons.sep_equinox);
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DisplayEvent('December solstice', seasons.dec_solstice);
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process.exit(0);
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} else {
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console.log('USAGE: node seasons.js year');
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process.exit(1);
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}
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}
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Demo();
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