Sky Position and Visibility
The altitude and azimuth of an object, culminations and visibility over the year from its coordinates and your location.
Enter coordinates as decimals. North latitude and east longitude are positive. The example is Vega from Moscow.
This calculator finds the altitude and azimuth of an object from the date, time and place, its culmination altitudes and its visibility over the year.
sin h = sin φ sin δ + cos φ cos δ cos t
The hour angle t is the local sidereal time minus the right ascension. The altitude at upper culmination is 90° − |φ − δ|.
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