Gensky Time format

Hi all,

I am using gensky to know the sunvector.

gensky 10 13 10:27CET +s -a 57.01305 -o -9.988333
does the time format used in the gensky command includes seconds also e.g i want to know the sun vector at 10:27:30 hrs ?
Best Regards,
Brajesh Lal

Hi Brajesh,

Gensky doesn't take HH:MM:SS format, but you can specify any number of digits using the alternative decimal hours. I.e., 10:27:30 translates to:

  10 + 27/60 + 30/3600 => 10.458333

% gensky 10 13 10.458333 +s -a 57.01305 -o -9.988333

Be aware that gensky doesn't have the more sophisticated orbital corrections, etc. that would permit it to predict the solar position with this kind of accuracy.

Best,
-Greg

···

From: Brajesh Lal <[email protected]>
Date: April 15, 2010 9:31:23 AM PDT

Hi all,

I am using gensky to know the sunvector.

gensky 10 13 10:27CET +s -a 57.01305 -o -9.988333

does the time format used in the gensky command includes seconds also e.g i want to know the sun vector at 10:27:30 hrs ?

Best Regards,
Brajesh Lal

Thanks Greg,

one more question
    10 + 27/60 + 30/3600 => 10.458333

% gensky 10 13 10.458333 +s -a 57.01305 -o -9.988333

is mentioning of CET timezone not required or i use meridian info ? I have previously generated required data using CET

% gensky 10 13 10.458333CET +s -a 57.01305 -o -9.988333 is it correct?
Best Regards, Brajesh Lal

···

________________________________
From: Greg Ward <[email protected]>
To: Radiance general discussion <[email protected]>
Sent: Thu, April 15, 2010 6:40:41 PM
Subject: Re: [Radiance-general] Gensky Time format

Hi Brajesh,

Gensky doesn't take HH:MM:SS format, but you can specify any number of digits using the alternative decimal hours. I.e., 10:27:30 translates to:

    10 + 27/60 + 30/3600 => 10.458333

% gensky 10 13 10.458333 +s -a 57.01305 -o -9.988333

Be aware that gensky doesn't have the more sophisticated orbital corrections, etc. that would permit it to predict the solar position with this kind of accuracy.

Best,
-Greg

From: Brajesh Lal <[email protected]>
Date: April 15, 2010 9:31:23 AM PDT

Hi all,

I am using gensky to know the sunvector.

gensky 10 13 10:27CET +s -a 57.01305 -o -9.988333

does the time format used in the gensky command includes seconds also e.g i want to know the sun vector at 10:27:30 hrs ?

Best Regards,
Brajesh Lal

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http://www.radiance-online.org/mailman/listinfo/radiance-general

Brajesh,

If you want more accurate sun vectors, I would suggest trying out the libnova package:

http://libnova.sourceforge.net/

It's pretty easy to build, and comes with some example code that will help you build a lightweight sun vector program quickly.

I use libnova to compute sun, moon, and star placements for a Radiance tool that I made called "genutahsky" (which works very much like gensky, but creates a more thorough, colorful, but less-flexible sky description). More on that tool here:

http://markjstock.org/radiance/

Mark

···

On Thu, 15 Apr 2010, Brajesh Lal wrote:

Hi all,

I am using gensky to know the sunvector.

gensky 10 13 10:27CET +s -a 57.01305 -o -9.988333
does the time format used in the gensky command includes seconds also e.g i want to know the sun vector at 10:27:30 hrs ?
Best Regards,
Brajesh Lal

Good stuff.

···

On Thu, Apr 15, 2010 at 1:35 PM, Mark Stock <[email protected]> wrote:

Brajesh,

If you want more accurate sun vectors, I would suggest trying out the
libnova package:

http://libnova.sourceforge.net/

It's pretty easy to build, and comes with some example code that will help
you build a lightweight sun vector program quickly.

I use libnova to compute sun, moon, and star placements for a Radiance tool
that I made called "genutahsky" (which works very much like gensky, but
creates a more thorough, colorful, but less-flexible sky description). More
on that tool here:

http://markjstock.org/radiance/

Mark

On Thu, 15 Apr 2010, Brajesh Lal wrote:

Hi all,

I am using gensky to know the sunvector.

gensky 10 13 10:27CET +s -a 57.01305 -o -9.988333
does the time format used in the gensky command includes seconds also e.g
i want to know the sun vector at 10:27:30 hrs ?
Best Regards,
Brajesh Lal

_______________________________________________
Radiance-general mailing list
[email protected]
http://www.radiance-online.org/mailman/listinfo/radiance-general