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equator_of_date.js defaults to current date/time.

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Allow this demo to use the current date and time by
default if the user does not specify one on the command
line. This required changing the order of the command line
parameters.
This commit is contained in:
Don Cross
2021-07-06 20:58:31 -04:00
parent 7d955c99ba
commit 5ea2bf65a1
3 changed files with 11 additions and 7 deletions
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15
demo/nodejs/equator_of_date.js
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@@ -6,14 +6,15 @@
*/
const UsageText = `
USAGE: node equator_of_date.js yyyy-mm-ddThh:mm:ssZ ra dec
USAGE: node equator_of_date.js ra dec [yyyy-mm-ddThh:mm:ssZ]
Converts J2000 equatorial coordinates to
equator-of-date coordinates.
yyyy-mm-ddThh:mm:ssZ = The date and time in UTC.
ra = J2000 Right ascension in sidereal hours (0 .. 24).
dec = J2000 Declination in degrees (-90 .. +90).
yyyy-mm-ddThh:mm:ssZ = Optional date and time in UTC.
(If omitted, the current date and time are used.)
This program prints out the right ascension and declination
of the same point in the sky, but expressed in the Earth's
@@ -41,14 +42,16 @@ function ParseDate(text) {
}
function Demo() {
if (process.argv.length !== 5) {
if (process.argv.length < 4 || process.argv.length > 5) {
console.log(UsageText);
process.exit(1);
} else {
// Parse the command line arguments.
const time = Astronomy.MakeTime(ParseDate(process.argv[2]));
const ra = ParseNumber("RA", process.argv[3], 0, 24);
const dec = ParseNumber("DEC", process.argv[4], -90, +90);
const ra = ParseNumber("RA", process.argv[2], 0, 24);
const dec = ParseNumber("DEC", process.argv[3], -90, +90);
const date = (process.argv.length > 4) ? ParseDate(process.argv[4]) : new Date();
const time = Astronomy.MakeTime(date);
console.log(`time = ${time}`);
// Create a rotation matrix that converts J2000 equatorial (EQJ)
// orientation to equator-of-date (EQD) orientation.

1
demo/nodejs/test/equator_of_date_correct.txt
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@@ -1 +1,2 @@
time = 2021-07-06T00:00:00.000Z
Equator-of-date coordinates: RA=12.0181, DEC=44.8820

2
demo/nodejs/test/test
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@@ -12,7 +12,7 @@ node equatorial.js 38.1256 -89.5544 215.7 23.5 2021-03-27T18:45:00Z > test/equat
diff test/equatorial.txt test/equatorial_correct.txt || Fail "Error comparing equatorial.js output."
echo "Testing example: equator_of_date.js"
node equator_of_date.js 2021-07-06T00:00:00Z 12 45 > test/equator_of_date.txt || Fail "Error testing equator_of_date.js"
node equator_of_date.js 12 45 2021-07-06T00:00:00Z > test/equator_of_date.txt || Fail "Error testing equator_of_date.js"
diff test/equator_of_date.txt test/equator_of_date_correct.txt || Fail "Error comparing equator_of_date.js output."
echo "Testing example: camera.js"