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software to plot Aitoff Projection

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16 years 9 months ago #46518 by albertw
software to plot Aitoff Projection was created by albertw
Hi,

I've been trying, fairly unsucessfully, to get gnuplot to plot an aitoff projection. Anyone know how to do it, or what software can do it easily (and freely!) from a set of lat/long coords?

Basically I want to change the graphic thats in my avatar, to a projection like
(though of the galaxy not the Earth!)

Cheers,
~Al (yep its writeup time again!)

Albert White MSc FRAS
Chairperson, International Dark Sky Association - Irish Section
www.darksky.ie/

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16 years 9 months ago #46530 by albertw
Replied by albertw on topic Re: software to plot Aitoff Projection
Worked it out.

Formulae taken from the Aitoff projection page on wilkipedia
[code:1]
XC(lat,lon)=(2*(acos(cos(lon)*cos(lat/2)))*cos(lon)*sin(lat/2))/sin(acos(cos(lon)*cos(lat/2)))
YC(lat,lon)=(( acos(cos(lon)*cos(lat/2)) *sin(lon) ) / sin( acos(cos(lon)*cos(lat/2)) ))
set angles degrees
plot "miranda.loc" using (XC($1,$2)):(YC($1,$2))[/code:1]

where "miranda.loc" is a file containing two columns; one for galactic lat and one for galactic lon.

Albert White MSc FRAS
Chairperson, International Dark Sky Association - Irish Section
www.darksky.ie/

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16 years 9 months ago #46531 by Seanie_Morris
Replied by Seanie_Morris on topic Re: software to plot Aitoff Projection

Worked it out.


Damn, you just beat me to it...

:P :lol:

Midlands Astronomy Club.
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16 years 9 months ago #46535 by albertw
Replied by albertw on topic Re: software to plot Aitoff Projection

Damn, you just beat me to it...

:P :lol:


again! :lol:

Albert White MSc FRAS
Chairperson, International Dark Sky Association - Irish Section
www.darksky.ie/

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16 years 9 months ago #46549 by dave_lillis
Replied by dave_lillis on topic Re: software to plot Aitoff Projection
Thats one high tech avatar Al. :lol:

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Chairman. Shannonside Astronomy Club (Limerick)

Carrying around my 20" obsession is going to kill me,
but what a way to go. :)
+ 12"LX200, MK67, Meade2045, 4"refractor

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16 years 9 months ago #46552 by albertw
Replied by albertw on topic Re: software to plot Aitoff Projection

Thats one high tech avatar Al. :lol:


It's taken about 3 months to draw :lol:

Albert White MSc FRAS
Chairperson, International Dark Sky Association - Irish Section
www.darksky.ie/

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