Astronomy: Eclipse Algorithms are based on Jean Meeus. Calculates eclipses (lunar eclipse and solar eclipse). Functions: DTm(JDE): JDE->Date-Time (rounded to minutes) eclipse(realyear,koff)->eclipse characteristics (or None) koff=0 for solar, -0.5 or 0.5 for lunar Example usage is in aeclipseuse.py (calendar). PLATFORMS: Numworks : ok BBC microbit-serial: ok
Results: Itsa: eclipse type (string)
DT: Date and time (minutes may be rounded)
Magnitude: The fraction of diameter (note: not the obscuration, or brightnesss) 0<magnitude<1 indicates partial 1<=magnitude indicates total (but see versions). Accuracy: ~2 sig figs when valid (solar annular, total and hybrid should be disregarded).
Gamma: How central the eclipse is, Accuracy ~ 3 sig figs.
Angled: Several angles in degrees
JDE: accurate time of peak
mins: semidurations (add or subtract from peak time) time should be adjusted by deltaT (currently < 2mins) to give UTC.
# version 0.1:
#Bug in calculation of solar time
# version 0.2: OK
#(but disregard magnitude of solar eclipses that are not partial)
#see versions for details