Dates for Solstices and Equinox
Dates and Times for Equinoxes, Solstices
and Perihelion/Aphelion
Times given in Universal Time
(See bottom of page for adjustment to main North American Time Zones)
2007
| Event | Date | Time (UT) |
| Perihelion | January 3 | 20 |
| Vernal (Spring) Equinox | March 21 | 00:07 |
| Summer Solstice | June 21 | 18:06 |
| Aphelion | July 7 | 00 |
| Autumnal Equinox | September 23 | 09: 51 |
| Winter Solstice | December 22 | 06:08 |
2008
| Event | Date | Time (UT) |
| Perihelion | January 3 | 00 |
| Vernal (Spring) Equinox | March 20 | 5:48 |
| Summer Solstice | June 20 | 23:59 |
| Aphelion | July 4 | 08 |
| Autumnal Equinox | September 22 | 15:44 |
| Winter Solstice | December 21 | 12:04 |
2009
| Event | Date | Time (UT) |
| Perihelion | January 4 | 15 |
| Vernal (Spring) Equinox | March 20 | 11:44 |
| Summer Solstice | June 21 | 05:45 |
| Aphelion | July 4 | 02 |
| Autumnal Equinox | September 22 | 21:18 |
| Winter Solstice | December 21 | 17:47 |
2010
| Event | Date | Time (UT) |
| Perihelion | January 3 | 00 |
| Vernal (Spring) Equinox | March 20 | 17:32 |
| Summer Solstice | June 21 | 11:28 |
| Aphelion | July 6 | 11 |
| Autumnal Equinox | September 23 | 03:09 |
| Winter Solstice | December 21 | 23:38 |
To Convert Universal Time (UT) To North American Time Zones (Standard Time)
| Time Zone | Subtract X Hours from UT |
| Newfoundland Standard Time | 3.5 |
| Atlantic Standard Time | 4 |
| Eastern Standard Time | 5 |
| Central Standard Time | 6 |
| Mountain Standard Time | 7 |
| Pacific Standard Time | 8 |
| Alaska Standard Time | 9 |
| Hawaii/Aleutian Standard Time | 10 |
For Daylight Saving Time, add one hour to the result |
Thus, 1100 UTC is the same as 6:00 AM EST and 7:00 AM EDT. When converting zone time to or from UTC, dates must be properly taken into account. For example, 21 March at 0200 UTC is the same as 20 March at 2100 or 9:00 PM EST.
The Weather Doctor's Diary ©2008 Keith C. Heidorn, PhD. All Rights Reserved.
Correspondence may be sent via email to: see@islandnet.com.
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