Module calendrical_calculations::astronomy

This file contains important structs and functions relating to location, time, and astronomy; these are intended for calender calculations and based off Calendrical Calculations by Reingold & Dershowitz.

TODO(#3709): Address inconcistencies with existing ICU code for extreme dates.

Structs

• Astronomical
  The Astronomical struct provides functions which support astronomical calculations used by many observational calendars.
• Location
  A Location on the Earth given as a latitude, longitude, elevation, and standard time zone. Latitude is given in degrees from -90 to 90, longitude in degrees from -180 to 180, elevation in meters, and zone as a UTC offset in fractional days (ex. UTC+1 would have zone = 1.0 / 24.0)

Constants

• J2000
  The Moment of noon on January 1, 2000
• MAX_UTC_OFFSET
  The maximum allowable UTC offset (+14 hours) in fractional days (14.0 / 24.0 days)
• MEAN_SYNODIC_MONTH
  The mean synodic month in days of 86400 atomic seconds (86400 seconds = 24 hours * 60 minutes/hour * 60 seconds/minute)
• MEAN_TROPICAL_YEAR
  The mean tropical year in days
• MECCA
  The location of Mecca; used for Islamic calendar calculations.
• MIN_UTC_OFFSET
  The minimum allowable UTC offset (-12 hours) in fractional days (-0.5 days)
• NEW_MOON_ZERO
  The moment of the first new moon of the CE, which occurred on January 11, 1 CE.
• WINTER
  The angle of winter for the purposes of solar calculations

Functions

• div_euclid_f64 🔒