| JD - 245000 | difference | |||||
| Spring Equinox | 2000 | 20-Mar | 0735 UT | 1623.82 | ||
| Summer Solstices | 2000 | 21-Jun | 0148 UT | 1716.58 | 92.76 | days |
| Fall Equinox | 2000 | 22-Sep | 1727 UT | 1810.23 | 93.65 | days |
| Winter Solstices | 2000 | 21-Dec | 1337 UT | 1900.07 | 89.84 | days |
| Spring Equinox | 2001 | 20-Mar | 1331 UT | 1989.1 | 89.03 | days |
| First day of Fall to first day of Winter to first day of Spring: | ||||||
| 89.94 + 89.03 = 178.87 days | ||||||
| First day of Spring to first day of Summer to first day of Fall: | ||||||
| 92.76 + 93.65 = 186.41 days 7.57 days longer, or about one week | ||||||
| JD = Julian Date | ||||||