Astronomy
- Ephemerides.
- Positions of Moon or other celestial objects.
- Julian day. Number of days that have elapsed since Monday, January 1, 4713 BC in the proleptic Julian calendar. The algorithm is a formula. Variations are: heliocentric, chronological, modified, reduced, truncated, Dublin Lilian julian day.
- Julian date. The Julian day, not rounded, decimal fraction.
Medical
- Computation useful in healthcare.
- Help to diagnosis.