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| Ron Gibbs |
 Posted: Fri Feb 29, 2008 7:53 am |
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I'm working on the design of solar collection optics, and trying to
calculate the meridional and sagittal angles of the sun (for a given
altitude & elevation) relative to a tilted plane. My brain hurts!
Has anyone out there (maybe working with imaging astronomical objects with a
stationary optical system) done this and/or can point me towards useful
texts/online resources to help with the trigonometry?
TIA
Ron |
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| Ron Gibbs |
| Posted: Fri Feb 29, 2008 9:47 am |
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"Ron Gibbs" <ron.gibbs@physics.org> wrote in message
news:47c7f237$0$521$c5fe31e7@reader.usenet4all.se...
Quote: I'm working on the design of solar collection optics, and trying to
calculate the meridional and sagittal angles of the sun (for a given
altitude & elevation) relative to a tilted plane. My brain hurts!
Has anyone out there (maybe working with imaging astronomical objects with
a stationary optical system) done this and/or can point me towards useful
texts/online resources to help with the trigonometry?
TIA
Ron
I now think I can do this, using 3D rotation matrices, and transforms
between spherical polar and cartesian coordinates.
Ron |
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| Phil Hobbs |
| Posted: Fri Feb 29, 2008 11:29 am |
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Ron Gibbs wrote:
Quote: "Ron Gibbs" <ron.gibbs@physics.org> wrote in message
news:47c7f237$0$521$c5fe31e7@reader.usenet4all.se...
I'm working on the design of solar collection optics, and trying to
calculate the meridional and sagittal angles of the sun (for a given
altitude & elevation) relative to a tilted plane. My brain hurts!
Has anyone out there (maybe working with imaging astronomical objects with
a stationary optical system) done this and/or can point me towards useful
texts/online resources to help with the trigonometry?
TIA
Ron
I now think I can do this, using 3D rotation matrices, and transforms
between spherical polar and cartesian coordinates.
Ron
That's how I've done it in the past. It's worth wasting a few cycles to
avoid blunders.
Cheers,
Phil Hobbs |
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| Ron Gibbs |
| Posted: Fri Feb 29, 2008 11:36 am |
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"Phil Hobbs" <pcdh@SpamMeSenseless.pergamos.net> wrote in message
news:47C824CC.9060108@SpamMeSenseless.pergamos.net...
Quote: Ron Gibbs wrote:
"Ron Gibbs" <ron.gibbs@physics.org> wrote in message
news:47c7f237$0$521$c5fe31e7@reader.usenet4all.se...
I'm working on the design of solar collection optics, and trying to
calculate the meridional and sagittal angles of the sun (for a given
altitude & elevation) relative to a tilted plane. My brain hurts!
Has anyone out there (maybe working with imaging astronomical objects
with a stationary optical system) done this and/or can point me towards
useful texts/online resources to help with the trigonometry?
TIA
Ron
I now think I can do this, using 3D rotation matrices, and transforms
between spherical polar and cartesian coordinates.
Ron
That's how I've done it in the past. It's worth wasting a few cycles to
avoid blunders.
Cheers,
Phil Hobbs
Thanks Phil. That gives me some confidence I am on the right path, give or
take a few blunders.
Ron |
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| Richard J Kinch |
| Posted: Fri Feb 29, 2008 4:14 pm |
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| Ron Gibbs |
| Posted: Fri Feb 29, 2008 5:18 pm |
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"Richard J Kinch" <kinch@truetex.com> wrote in message
news:Xns9A539B1A1D4D9someconundrum@216.196.97.131...
Thanks, but I found many resources with suchlike solar path calculations
(and more relevant than this one).
I have now solved the coordinate rotation problem, and tested the solution
thoroughly (and invoiced the client!). Busy day.
Ron |
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