20,000-Year Lunar Phase Calculator

20,000-Year Lunar Phase Calculator
BC 9999-Mar-21-Thu 00:00:00.0006 TT to AD 9999-Dec-30-Thu 12:00:00.0011 TT
or
BC 9999-Mar-15-Thu 21:49:54.7144 UT to AD 9999-Dec-30-Thu 11:58:50.8171 UT
PHP Program by Jay Tanner - 2025 - Built Around The NASA/JPL Horizons API

Optional Location Name

Geographic GPS Coordinates

Longitude Latitude Altitude m

Base Time Scale Time Zone Daylight / Summer Time

Date and Time

View PHP Source Code

Download This Program + Phase Images (Approx. 13.2 MB)

Phase Angle: °

Distance: km = mi

Double-Click Within Text Area to Select ALL Text

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         TOPOCENTRIC LUNAR PHASE CALCULATOR FOR
           ANY GIVEN DATE, TIME AND LOCATION

Calendar Date/Time
AD 2025-Nov-27  11:05:03
Time Scale: 1
Time Zone UT-05:00 (Ignored if TT Scale)


Location Name
Central New York State, USA

Longitude  = -76.862737°
Latitude   = +42.904788°
Altitude   = +150 m

Reference Frame ICRF
International Celestial Reference Frame

Mean refraction is applied to rise/set computations.