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Happy Vernal Equinox!
- Thread starter Strobengh
- Start date
- Joined
- Sep 2, 2006
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- 16,703
Yeah, I know. Was a young astronomer before I became an old physicist.
At almost precisely 20:07 hours East Coast time.
At almost precisely 20:07 hours East Coast time.
- Joined
- Mar 10, 2002
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- 19,806
better look it up, it was changed this year, every so often it falls on the 21st
"The date (near March 21 in the northern hemisphere) when night and day are nearly the same length and Sun crosses the celestial equator (i.e., declination 0) moving northward. In the southern hemisphere, the vernal equinox corresponds to the center of the Sun crossing the celestial equator moving southward and occurs on the date of the northern autumnal equinox. The vernal equinox marks the first day of the season of spring. The right ascension at the vernal equinox originally was in the constellation Aries and the point of crossing was known as the first point in Aries (now actually in Pisces because of precession ).
The above plots show how the date of the vernal equinox shifts through the Gregorian calendar according to the insertion of leap years. The table below gives the universal time of the vernal equinox. To convert to U. S. Eastern standard time, subtract 5 hours, so the vernal equinox occurs on March 20, 2001 at 8:14 a.m. EST.
Note that the times below were calculated using VernalEquinox[] in the Mathematica application package Scientific Astronomer, which is accurate to within only an hour or so, and in practice gives times that differ by up to 15 minutes from those computed by the U.S. Naval Observatory (which computes March 21, 1999 at 01:46 UT instead of 01:36 UT and March 20, 2000 at 07:35 UT instead of 07:25). "
"The date (near March 21 in the northern hemisphere) when night and day are nearly the same length and Sun crosses the celestial equator (i.e., declination 0) moving northward. In the southern hemisphere, the vernal equinox corresponds to the center of the Sun crossing the celestial equator moving southward and occurs on the date of the northern autumnal equinox. The vernal equinox marks the first day of the season of spring. The right ascension at the vernal equinox originally was in the constellation Aries and the point of crossing was known as the first point in Aries (now actually in Pisces because of precession ).
The above plots show how the date of the vernal equinox shifts through the Gregorian calendar according to the insertion of leap years. The table below gives the universal time of the vernal equinox. To convert to U. S. Eastern standard time, subtract 5 hours, so the vernal equinox occurs on March 20, 2001 at 8:14 a.m. EST.
Note that the times below were calculated using VernalEquinox[] in the Mathematica application package Scientific Astronomer, which is accurate to within only an hour or so, and in practice gives times that differ by up to 15 minutes from those computed by the U.S. Naval Observatory (which computes March 21, 1999 at 01:46 UT instead of 01:36 UT and March 20, 2000 at 07:35 UT instead of 07:25). "
- Joined
- Mar 10, 2002
- Messages
- 19,806
i guess the warden is Irish and got really po'ed when one of his cons splashed mud on his mistress. he drank a bottle of johnny walker blue and went tiger hunting in the dark of night...
the drunk sob will prolly get snake bit... bad deal, really bad deal...
i'll bet the vernal equinox, will restore his luck O the Irish.
the drunk sob will prolly get snake bit... bad deal, really bad deal...
i'll bet the vernal equinox, will restore his luck O the Irish.
- Joined
- Sep 2, 2006
- Messages
- 16,703
Year
Vernal equinox
2007
21 March, 00.07
This is in Universal Time (essentially Greenwich Mean Time). Remove four hours to get East Coast time...which backs the Vernal Equinox into...20 March at 20:07 hrs East Coast time.
You did make me nervous, though -- I actually checked the National Maritime Museum site (Royal Greenwich Observatory) to be sure I hadn't messed up.
What the heck...just to be sure, from Infoplease: "On March 20, 2007, at precisely 8:07 P.M. EDT (March 21, 00:07 Universal Time), the Sun will cross directly over the Earth's equator. This moment is known as the vernal equinox in the Northern Hemisphere."
You can even find the same answer on Astrology.com!
What the heck -- we can always declare the VE to be 21 March Busse Time!!
Vernal equinox
2007
21 March, 00.07
This is in Universal Time (essentially Greenwich Mean Time). Remove four hours to get East Coast time...which backs the Vernal Equinox into...20 March at 20:07 hrs East Coast time.
You did make me nervous, though -- I actually checked the National Maritime Museum site (Royal Greenwich Observatory) to be sure I hadn't messed up.
What the heck...just to be sure, from Infoplease: "On March 20, 2007, at precisely 8:07 P.M. EDT (March 21, 00:07 Universal Time), the Sun will cross directly over the Earth's equator. This moment is known as the vernal equinox in the Northern Hemisphere."
You can even find the same answer on Astrology.com!
What the heck -- we can always declare the VE to be 21 March Busse Time!!
- Joined
- Feb 6, 2001
- Messages
- 4,072
Now that that's cleared up.........
Did anyone catch the pairing in the Western sky this evening? Venus and a slender crescent moon. Jack Horkheimer : Star Gazer
All I saw were clouds.
∞
Did anyone catch the pairing in the Western sky this evening? Venus and a slender crescent moon. Jack Horkheimer : Star Gazer
All I saw were clouds.
∞
- Joined
- Nov 13, 2004
- Messages
- 650
The estimate that Skunk provided (March 21, 1999 at 01:46 UT) is approximately correct. The real spring arrives when the same old pair of geese arrives (in Calgary) ahead of the crowd and builds their nest in the usual place under a local bridge. They got here about a week ago and that means it definitely spring.
Their arrival also means it's INFI-time! Jerry is on the record on this one and confirms that the mysterious workings of INFI delivery (especially "2 weeks") is related to geese. The arrival of the geese is a very positive sign.
Their arrival also means it's INFI-time! Jerry is on the record on this one and confirms that the mysterious workings of INFI delivery (especially "2 weeks") is related to geese. The arrival of the geese is a very positive sign.
Confused about what the vernal equinox is, or the purpose of the thread?
The vernal and autumnal equinox are the two times each year that the sun passes directly over the equator, and night and day are of equal length.
So, yesterday, at 8:07 est, the sun was directly over the equator, and we had exactly 12 hours of daylight, and 12 hours of darkness.
The purpose of the thread . . . who knows. I'm still confused, and I started it.
Just wanted to wish everyone a happy vernal/autumnal equinox.
:thumbup:
The vernal and autumnal equinox are the two times each year that the sun passes directly over the equator, and night and day are of equal length.
So, yesterday, at 8:07 est, the sun was directly over the equator, and we had exactly 12 hours of daylight, and 12 hours of darkness.
The purpose of the thread . . . who knows. I'm still confused, and I started it.
Just wanted to wish everyone a happy vernal/autumnal equinox.
:thumbup: