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Questions on systems to uniquely determine position of a point or other geometric element on a manifold such as Euclidean space.

33 votes

How to describe the Sun's location to an alien from our Galaxy?

This has already been done. The pioneer 10 and 11 probes have a description of the solar system's location and Earth engraved for aliens to understand (or so one hopes). The physical parameters of our …
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4 votes

Latitude, longitude and altitude of Ckoirama Observatory; where can things like this be look...

A list of "everything in the world" is difficult to create and also maintain: it needs both a dedicated maintainer as well as people who supply the maintainer with the information. Thus on the latter …
planetmaker's user avatar
  • 21.4k
3 votes

Doubt about a computation in Jules Verne

Your reasoning is sound, your calculation correct. It's easy judgement, if one recalls that originally the nautical mile was defined as the length corresponding to one arc minute at the equator. So ev …
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6 votes
Accepted

What is a "fundamental location", and why is Mosting A defined as one for the moon?

Every coordinate system needs one point defined as exact and unambiguous - the fundamental location which all other location measurements in the vicinity are relative to. … This can be the origin of the coordinate system (like 0° longitude and 0° latitude) - but it can also be any other point instead. …
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3 votes
Accepted

Where do the symbols $\lambda$ and $\beta$ come from for celestial latitude and longitude?

German: $\lambda$ (or l) like Länge (longitude) und $\beta$ (or b) like Breite (lattitude). A century ago it used to be a language many science papers were published in and English was far from domina …
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