SPICE-based Lunar Calculator

Basic Readme - How to use this page

Supported epoch range: 1600-01-01 through 2600-12-31
Note on ΔT:
The automatic ΔT value is a broad historical polynomial estimate which affects only the displayed UT and sidereal-time values.
The primary SPICE geometry is evaluated directly for the entered TT epoch without regard for the displayed value of ΔT.
For precision work with modern UT or sidereal time, verify ΔT against current published values.

SPICE Values:

All SPICE-derived equatorial coordinates are computed from a backend API using NASA NAIF DE440 SPICE kernels, and are expressed in the Earth mean equator and equinox of J2000.0 (ICRF-compatible) reference frame. All values are geocentric and geometric.

Other Values:

Reference / time / educational quantities
Technical Details
References