Star Charts

This package contains two HTML pages local star charts and equatorial star charts.

The local star charts webpage uses the computer's clock to obtain the current local time and then uses it to calculate the local sidereal times and plot star charts at two locations.

The equatorial star charts webpage uses the computer's clock to obtain the current time and plot star charts showing the positions of the Sun, Moon, planets and stars on three star charts based on the equatorial coordinate system associated with J2000.0 mean equator and equinox.

All calculations are done using JavaScript. The physics and mathematics involved in creating the star charts is explained briefly in this pdf document.