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I'm loving this anticyclone
Will Hand wrote: "Scott W" wrote in message s.com... Will Hand wrote: Well at first I thought it would be boring, but the boundary layer variation and subtleties are fascinating. Better get used to it folks, it looks like it could hang around till January. What are your thoughts on it drifting north, Will? I feel the high will stay more or less where it is. Or even move west a tad. Could be wrong though! It should run through to the 27th and then tend toward a thundery spell but the conditions for them are slightly different are they not? Here are the times of those lunar phases: New moon: Dec 20th 14:01 First quarter: Dec 27th 14:48 http://sunearth.gsfc.nasa.gov/eclips...hases2001.html So if it does last, it will move west. And as for moving north, that might be dependent on the lunar declination (its position compared to the equator - which as it happens is similar to that of the sun's at the moment; so it can only rise (and possibly bring the weather with it.)) http://www.fourmilab.ch/cgi-bin/Solar As it also happens, the most interesting day as far as the lunar declination is concerned is on the 25th. The moon will be at some 60 degrees to us then. (Can someone tell me what "Delta" signifies in these tables: http://sunearth.gsfc.nasa.gov/eclips...hases2001.html) |
#2
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I'm loving this anticyclone
This is a good explanation of delta-t. Better than I could do anyway.
Happy Christmas, clear skies and all that... Weatherlawyer wrote: Will Hand wrote: "Scott W" wrote in message s.com... Will Hand wrote: Well at first I thought it would be boring, but the boundary layer variation and subtleties are fascinating. Better get used to it folks, it looks like it could hang around till January. What are your thoughts on it drifting north, Will? I feel the high will stay more or less where it is. Or even move west a tad. Could be wrong though! It should run through to the 27th and then tend toward a thundery spell but the conditions for them are slightly different are they not? Here are the times of those lunar phases: New moon: Dec 20th 14:01 First quarter: Dec 27th 14:48 http://sunearth.gsfc.nasa.gov/eclips...hases2001.html So if it does last, it will move west. And as for moving north, that might be dependent on the lunar declination (its position compared to the equator - which as it happens is similar to that of the sun's at the moment; so it can only rise (and possibly bring the weather with it.)) http://www.fourmilab.ch/cgi-bin/Solar As it also happens, the most interesting day as far as the lunar declination is concerned is on the 25th. The moon will be at some 60 degrees to us then. (Can someone tell me what "Delta" signifies in these tables: http://sunearth.gsfc.nasa.gov/eclips...hases2001.html) |
#3
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I'm loving this anticyclone
Sorry, forgot to include the link. D'oh!
http://sunearth.gsfc.nasa.gov/eclips...lp/deltaT.html davehowes wrote: This is a good explanation of delta-t. Better than I could do anyway. Happy Christmas, clear skies and all that... Weatherlawyer wrote: Will Hand wrote: "Scott W" wrote in message s.com... Will Hand wrote: Well at first I thought it would be boring, but the boundary layer variation and subtleties are fascinating. Better get used to it folks, it looks like it could hang around till January. What are your thoughts on it drifting north, Will? I feel the high will stay more or less where it is. Or even move west a tad. Could be wrong though! It should run through to the 27th and then tend toward a thundery spell but the conditions for them are slightly different are they not? Here are the times of those lunar phases: New moon: Dec 20th 14:01 First quarter: Dec 27th 14:48 http://sunearth.gsfc.nasa.gov/eclips...hases2001.html So if it does last, it will move west. And as for moving north, that might be dependent on the lunar declination (its position compared to the equator - which as it happens is similar to that of the sun's at the moment; so it can only rise (and possibly bring the weather with it.)) http://www.fourmilab.ch/cgi-bin/Solar As it also happens, the most interesting day as far as the lunar declination is concerned is on the 25th. The moon will be at some 60 degrees to us then. (Can someone tell me what "Delta" signifies in these tables: http://sunearth.gsfc.nasa.gov/eclips...hases2001.html) |
#4
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I'm loving this anticyclone
davehowes wrote: Weatherlawyer wrote: (Can someone tell me what "Delta" signifies in these tables: http://sunearth.gsfc.nasa.gov/eclips...hases2001.html) This is a good explanation of delta-t. Better than I could do anyway. Happy Christmas, clear skies and all that... http://sunearth.gsfc.nasa.gov/eclips...lp/deltaT.html If you can explain how to apply it I may just forgive you top posting. How am I supposed to view the tables? Are they corrected and delta is there for a reference or are they supposed to be added or subtracted? Yes I know that the tables wouldn't be prepared inaccurately. It does seem rather daft preparing tables of lunar phases that might well be several hours out though: "It is important to pay attention to the differences in delta T, depending on the author especially when studying old eclipses, say before AD 1000. In AD 1500 there is a difference of 95 seconds between the values given by Stephenson & Houlden in 1986 and those by Stephenson in 1997; In AD 1000 the difference is only 25 seconds between the values given by Stephenson & Houlden and Stephenson, but there is a difference of almost 200 seconds with the Jones' values; In AD 500 the difference between the Stephensons & Houlden (1986) and Stephenson (1997) values amount to 1123 seconds, while the difference with Jones' values reach 818 seconds; For the earlier centuries the differences are rapidly increasing to exceed 11400 seconds (this is more than 3 hours !!) around 2000 BC. When studying ancient eclipses it is important to keep these uncertainties in mind." http://user.online.be/felixverbelen/dt.htm |
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