Sun & Moon Position

Choose a location or enter coordinates, then a date, time and time zone. Calculate gives the Sun and Moon’s geometric altitude and azimuth at that instant, plus rise, upper meridian transit and set for the selected calendar day.

UTC is the default. Local uses your browser’s displayed time zone, even for a different location preset. It includes daylight saving changes; a nonexistent clock time is rejected. A repeated autumn time selects its first occurrence. Changing the zone reinterprets the entered clock time. Now selects the current instant; Copy copies the main table.

Altitude 0° is the horizon; negative values are below it. Azimuth runs clockwise from north: east 90°, south 180°, west 270°. The Moon’s altitude includes observer parallax at sea level, without atmospheric refraction. Illumination is geocentric.

Rise/set times refer to the upper limb at a flat sea-level horizon with standard refraction. Twilight uses solar center altitudes −6°, −12° and −18°. A dash means no event of that type on the selected day; set can precede rise. Meridian transit is the upper north–south crossing, not necessarily the instant of maximum altitude.

Twilight and approximate geocentric RA/Dec and distances are in the details. These are simplified ephemerides for 1900–2100, using UTC as approximate UT1; terrain, observer height, weather and precise time-scale corrections are absent. Minute rounding is not an accuracy guarantee, particularly for the Moon and polar latitudes. USNO event definitions.