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Re: Local solar time [message #39990 is a reply to message #39904]

Tue, 29 June 2004 02:48

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

David Oesch <oesch@giub.nospam.unibe.ch> writes:

> Craig Markwardt wrote:
>
>> "Haje Korth" <haje.korth@jhuapl.edu> writes:
>>
>>
>>> Check the ESRG IDL library. Maybe zensun.pro does what you want.
>>>
>>>
>>
>> I don't think this is the right thing, but it's close. Local solar
>> time would be the hour angle (=longitude) of the sun, not the zenith
>> angle.
>>
>>
> Yes.. I stummbled over zensun in ESRG already..it ain't that what I'm
> looking for...

With some massaging, I think you can get what you want by using the
IDL Astronomy Library routines SUNPOS to compute the (RA, DEC)
position of the sun, and CT2LST, to compute the local mean sidereal
time, and then use the definition,

local hour angle of the sun = local sidereal time - RA of sun

[ in the proper units of course ]

Craig

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Craig B. Markwardt, Ph.D. EMAIL: craigmnet@REMOVEcow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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[Message index]

		Local solar time By: David Oesch on Mon, 28 June 2004 02:01
		Re: Local solar time By: David Fanning on Wed, 30 June 2004 06:29
		Re: Local solar time By: kuyper on Wed, 30 June 2004 05:59
		Re: Local solar time By: Craig Markwardt on Tue, 29 June 2004 16:36
		Re: Local solar time By: James Kuyper on Tue, 29 June 2004 13:19
		Re: Local solar time By: Craig Markwardt on Tue, 29 June 2004 12:13
		Re: Local solar time By: Craig Markwardt on Tue, 29 June 2004 11:58
		Re: Local solar time By: Craig Markwardt on Tue, 29 June 2004 11:54
		Re: Local solar time By: Michael Wallace on Tue, 29 June 2004 08:28
		Re: Local solar time By: Haje Korth on Tue, 29 June 2004 08:00
		Re: Local solar time By: Haje Korth on Tue, 29 June 2004 05:12
		Re: Local solar time By: David Oesch on Tue, 29 June 2004 05:12
		Re: Local solar time By: Haje Korth on Tue, 29 June 2004 05:09
		Re: Local solar time By: James Kuyper on Tue, 29 June 2004 04:51
		Re: Local solar time By: Craig Markwardt on Tue, 29 June 2004 02:48
		Re: Local solar time By: David Oesch on Mon, 28 June 2004 23:31
		Re: Local solar time By: Craig Markwardt on Mon, 28 June 2004 20:46
		Re: Local solar time By: Haje Korth on Mon, 28 June 2004 08:07

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