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software to plot Aitoff Projection

  • albertw
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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/
15 years 8 months ago #46518

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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/
15 years 8 months ago #46530

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Replied by Seanie_Morris on topic Re: software to plot Aitoff Projection

Worked it out.


Damn, you just beat me to it...

:P :lol:
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15 years 8 months ago #46531

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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/
15 years 8 months ago #46535

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Replied by dave_lillis on topic Re: software to plot Aitoff Projection

Thats one high tech avatar Al. :lol:
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15 years 8 months ago #46549

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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/
15 years 8 months ago #46552

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