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#1
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Houston has 12:00 hours of light today
yea!
-- = J. Kolenovsky, A+, Network +, MCP =F4=BF=F4 - http://www.celestialhabitats.com - commercial =F4=BF=F4 - http://www.hal-pc.org/~garden/personal.html |
#2
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Houston has 12:00 hours of light today
J Kolenovsky wrote:
yea! -- J. Kolenovsky, A+, Network +, MCP τΏτ - http://www.celestialhabitats.com - commercial τΏτ - http://www.hal-pc.org/~garden/personal.html Noticed for the first time that the "pointer" stars in Ursa Major are due south of Polaris at midnight. Another harbinger of spring. |
#3
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Houston has 12:00 hours of light today
Really? How did you accomplish that with the Equinox a week away?
Iris, Central NY, Zone 5a, Sunset Zone 40 "If we see light at the end of the tunnel, It's the light of the oncoming train." Robert Lowell (1917-1977) |
#4
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Houston has 12:00 hours of light today
"Iris Cohen" wrote in message ... Really? How did you accomplish that with the Equinox a week away? Iris, Central NY, Zone 5a, Sunset Zone 40 "If we see light at the end of the tunnel, It's the light of the oncoming train." Robert Lowell (1917-1977) I thought the same that the equinox was on 20th or 21st March but my ephemeris says that on 16 March at Houston sunrise and sunset are 12 hrs apart, it also says that here (Sydney) we don't reach the same condition until 25th March, whereas in New York NY (how far from there are you?) it is the17th. Assuming that my ephemeris is accurate I have no explanation for these small discrepancies. David |
#5
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Houston has 12:00 hours of light today
Refraction of sunlight through Earth's atmosphere extends daylight by
several minutes. Without an atmosphere, there would be exactly 12 hours only on the equinoxes and at the equator. Go here http://aa.usno.navy.mil/data/docs/RS_OneYear.html and set the coordinates to 0 degrees latitude to see that each day is longer than 12 hours by about 7 minutes year-round at the equator. Here at 36deg 41' N, March 16 is the first 12 hour day. March 20 is 12 hours, 7 minutes -- just like at the equator on the same day. Iris Cohen wrote: Really? How did you accomplish that with the Equinox a week away? Iris, Central NY, Zone 5a, Sunset Zone 40 "If we see light at the end of the tunnel, It's the light of the oncoming train." Robert Lowell (1917-1977) |
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