User talk:180.150.114.156

Is this a mistake: "The horizontal coordinate system, also known as topocentric coordinate system,..."?

Seems to me the two are not equivalent.

https://www.oxfordreference.com/view/10.1093/acref/9780199609055.001.0001/acref-9780199609055-e-3773

Defines topocentric coordinates simply as:

"A system of coordinates with their origin at a point on the Earth's surface..."

So, not all horizontal coordinate system are topocentric because we can define horizontal coordinate system bellow or above earths surface.

Also, not all topocentric coordinate system are horizontal, because we can orient them in anyway.

Only some horizontal coordinate systems are topocentric, and only some topocentric coordinate systems are horizontal.

A horizontal & topocentric coordinate system is one that is on the Earths surface and aligned with horizon.

This wold also be consistent with the term "Barycentric" and "Geocentric" that define the origin but orientation.

Suggestion:

1) delete ", also known as topocentric coordinate system," from first paragraph.

2) add a caution: "A horizontal coordinate system should not be confused with a topocentric coordinate system. A horizontal coordinate system daffiness the orientation but not the location of the origin, where as a topocentric coordinate system defines the location origin as being on the Earth's surface, but not the orientation."