HGI

Alternative definitions (1), class: vernacular (0)
Term: HGI
Definition:

Heliographic Inertial - A heliocentriccoordinate system where the Z axis is normal to the solar equatorial plane,positive northward. X axis is along the intersection line between solarequatorial and ecliptic planes. The X axis was positive at SE longitude of74.367 deg on Jan 1, 1900. (See SE below.) Seehttp://nssdc.gsfc.nasa.gov/space/helios/coor_des.html

Created 2023.04.16
Last Modified 2023.04.16
Contributed by Ryan McGranaghan
Permalink:
https://n2t.net/ark:/99152/h10322