The Greg Calendar at a Glance

Year Published 1880
Days per Week none
Days per Month N/A
Months per Year none
Base Year Length 668
Leap Days undefined
Leap Day Position N/A
Basic Intercalation Formula undefined
Extended Intercalation Formula
(\ denotes integer division)		 undefined
Mean Length of Calendar Year undefined
Base Astronomical Year Vernal Equinox
Accuracy undefined
Cycle of Perpetuity 1 year
Mean LS of Beginning of Year 0.0
Year Count Start undefined
Epoch (CE) -22981
Epoch (JD) undefined
 

Notes:

  1. This the earliest known Martian calendar.

  2. This is one of several 0-month calendars.

Document Excerpts from Across the Zodiac
Percy Greg
Calendar Calendar
Martian Time

Martian Time

Martian Time Survey

Martian Time Survey 2.2