Gregorian Calendar

Leap year in years:
• divisible by 4 +1
• unless by 100 -1
• unless by 400 +1

Mars info

Dec 31 1999 20h:40m:32s GMT = 0h:0m:0s Martain 0 Longitude at Airy Crater (AMST)
0h:0m:0s 1/1/00 GMT = 3h:19m:28s AMST

May 6 2003 autumnal equinox Northern hemisphere
Aug 27 2003 10h GMT Closest approach to earth
Aug 28 2003 18h GMT opposition in Aquarius
Aug 29 perihelion
Sept 29 winter solstice