User talk:SergeyDarkleader

Horizontal coordinate system does not imply topocentric
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 at the end of the next section: "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."

Horizontal coordinates can include range and can use Cartesian coordinates
The opening paragraph reads:

"The horizontal coordinate system is a celestial coordinate system that uses the observer's local horizon as the fundamental plane. Coordinates of an object in the sky are expressed in terms of altitude (or elevation) angle and azimuth."

This implies that all Horizontal coordinates define direction only and using polar coordinates only, but states it is a "celestial coordinate system" which may include range and may use Cartesian coordinates.

Suggestion:

1) replace with: "The horizontal coordinate system is a celestial coordinate system that uses the observer's local horizon as the fundamental plane. It is often used to specify a location in the sky using an elevation (aka altitude) and an azimuth angle. However, in general a location can include range or can be specified using any coordinate system, such as Cartesian."

Apparent magnitudes table error
The table "Standard apparent magnitudes and fluxes for typical bands" lists various bands. Jy column appears to follow the spectral black body curve, as would be expected, since the units are per Hz, and agnostic of the band width, however the Jy values for bands g,r,i,z are inconsistent and appear to be in error