04-26-2018, 01:43 AM
What's the URL of the image you downloaded?
The map is oval because ESA uses the "Hammer" projection to translate the sky's spherical shape into flat images. This is documented at https://www.cosmos.esa.int/web/gaia/gaia...kyincolour
They don't use Tissot's.
There are many different types of map projections. See https://en.wikipedia.org/wiki/Map_projection
Celestia uses "Plate Carre" for its planetary maps, for example, which is also called "equirectangular".
The map is oval because ESA uses the "Hammer" projection to translate the sky's spherical shape into flat images. This is documented at https://www.cosmos.esa.int/web/gaia/gaia...kyincolour
They don't use Tissot's.
There are many different types of map projections. See https://en.wikipedia.org/wiki/Map_projection
Celestia uses "Plate Carre" for its planetary maps, for example, which is also called "equirectangular".
Selden