Questions tagged [symbols]

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Why is the globe/compass symbol used more often than the globus cruciger for Earth?

Why is that symbol 🜨 used more often (or almost always) when portraying e.g. Earth mass or Earth radii than the globus cruciger ♁ ? From my point of view the globus cruciger fits much better as ...
1
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1answer
87 views

Usage of the standard solar system (astronomical) symbols

Note: this is a follow-up question based on answers I've received in TeX SE on Packages for standard solar system (astronomical) symbols on the off-chance that some here may have actual hands-on ...
2
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1answer
72 views

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

I'm reading Episodes From the Early History of Astronomy, and the author mentions the system of celestial coordinates based on the ecliptic. In this system, the two coordinates are latitude and ...
1
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1answer
866 views

What are the correct symbols for vernal and autumnal equinox?

What are the correct symbols for vernal and autumnal equinox? I have seen people use both ♈︎ (\Aries) and $\gamma$ (\gamma) to denote vernal equinox. However, I have never seen the symbol for ...
3
votes
1answer
140 views

When are the symbols ⊕ and ♁ used to designate Earth?

In astronomy I usually see Earth designated with a circled plus or cross. NASA says this is the Earth's astronomical symbol. Wikipedia tends to use it, for example designating the Earth–Moon distance ...
12
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4answers
9k views

Usage of $\sim$, $\approx$, $\simeq$, and $\cong$ in observational astronomy?

My understanding is $\sim$ generally means "on the order of magnitude of" e.g. $T \sim 10^5$ K $\approx$ is obviously "approximately equal to" so for example one might write $d \approx 400$ pc rather ...
6
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1answer
1k views

Why is the symbol of Vernal Equinox ♈?

Since the direction of Vernal Equinox lies in the Pisces constellation, why is its symbol Aries? Shouldn't it be ♓ ? Is this a historical anachronism, only invalidated by axial precession of Earth?