<p>Method 1:</p>
<p><a href="https://upload.wikimedia.org/wikipedia/commons/thumb/7/72/Sinus_und_Kosinus_am_Einheitskreis_1.svg" rel="nofollow noreferrer">https://upload.wikimedia.org/wikipedia/commons/thumb/7/72/Sinus_und_Kosinus_am_Einheitskreis_1.svg</a></p>
<p>You know the Radius of the earth and the lattitude kindof, you can convert the lattitude using Sin or Cos function.</p>
<p>Method 2:</p>
<p>Rhumb line tool online, because parallels are rhumb lines:</p>
<p><a href="https://www.madinstro.net/sundry/navigation/rhumb_line.html" rel="nofollow noreferrer">https://www.madinstro.net/sundry/navigation/rhumb_line.html</a></p>
<p>if you have a 1/2 or a full rhumb circle of a parallel using the GSM ellipsoid/spheroid, then you just need to know the radius.</p>

CC BY-SA 4.0
2023-09-03T16:10:38.680Z
Please add the relevant content to your answer. "Link-only" answers deprecate quickly and are better suited for comments.
f.thorpe
CC BY-SA 4.0
2023-09-04T00:28:16.520Z
Just my luck. The wiki page to the sine and cosine page is down!
JohnHoltz
CC BY-SA 4.0
2023-09-04T10:31:02.950Z
Sorry the link was SVG and stack refused to upload it. if the server is down, copy paste the image name: Sinus_und_Kosinus_am_Einheitskreis_1.svg
bandybabboon
CC BY-SA 4.0
2023-09-03T10:12:51.477Z
2023-09-03T10:12:51.477Z
bandybabboon
<p>Todays Biue Moon (that wont happen again til 2036)  is the biggest brightest and closest the moon is to Earth
Im trying to determine how it appears at ones given latitude.Obviously the closest one is to the equator the larger and brighter it should appear. I asked  Google but could not find a formula to determine the thickness of the Earth by horizontal cross section at a given latitude. Those  show the distance from a given latitude to the Earths center as clearly indicated by their nearly uniform measurement whether from the equator or the poles!</p>

CC BY-SA 4.0
2023-08-31T21:33:22.080Z
Can you clarify your question? Perhaps add a sketch that shows the dimension you want to know. Since the Earth's diameter is 12800 km and the Moon's distance is 384000 km, the change in size due to location is small (on the order of 3%).
JohnHoltz
CC BY-SA 4.0
2023-09-03T17:54:07.623Z
Note: blue moons occur about every 29.5 months on average... the next blue moon is May 2026.  There's won't be another blue "supermoon" until 2036.  Not that most people can tell that ~3% difference between a supermoon and a regular or "inferior" ("infra?") moon anyways.  (Talking about monthly supermoons, not seasonal ones, the more old-style meaning)
JeopardyTempest
<earth-observation><moon>
Im trying to find a formula to calculate Earths radius/ diameter by horizontal cross section to see what effect that has on size of the moon appears
Frederick Frank
# Im trying to find a formula to calculate Earths radius/ diameter by horizontal cross section to see what effect that has on size of the moon appears

(Asked by: username_0 on 2023-08-30)

Todays Biue Moon (that wont happen again til 2036) is the biggest brightest and closest the moon is to Earth
Im trying to determine how it appears at ones given latitude.Obviously the closest one is to the equator the larger and brighter it should appear. I asked Google but could not find a formula to determine the thickness of the Earth by horizontal cross section at a given latitude. Those show the distance from a given latitude to the Earths center as clearly indicated by their nearly uniform measurement whether from the equator or the poles!

**Tags:** earth-observation, moon

> **Comments:**
> **username_1**: Can you clarify your question? Perhaps add a sketch that shows the dimension you want to know. Since the Earth's diameter is 12800 km and the Moon's distance is 384000 km, the change in size due to location is small (on the order of 3%).  
> **username_2**: Note: blue moons occur about every 29.5 months on average... the next blue moon is May 2026.  There's won't be another blue "supermoon" until 2036.  Not that most people can tell that ~3% difference between a supermoon and a regular or "inferior" ("infra?") moon anyways.  (Talking about monthly supermoons, not seasonal ones, the more old-style meaning)  

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## 1 answers

### Answer by username_3 on 2023-09-03. Score: -1

Method 1:

<https://upload.wikimedia.org/wikipedia/commons/thumb/7/72/Sinus_und_Kosinus_am_Einheitskreis_1.svg>

You know the Radius of the earth and the lattitude kindof, you can convert the lattitude using Sin or Cos function.

Method 2:

Rhumb line tool online, because parallels are rhumb lines:

<https://www.madinstro.net/sundry/navigation/rhumb_line.html>

if you have a 1/2 or a full rhumb circle of a parallel using the GSM ellipsoid/spheroid, then you just need to know the radius.

> **Comments:**
> **username_4**: Please add the relevant content to your answer. "Link-only" answers deprecate quickly and are better suited for comments.  
> **username_1**: Just my luck. The wiki page to the sine and cosine page is down!  
> **username_3**: Sorry the link was SVG and stack refused to upload it. if the server is down, copy paste the image name: Sinus_und_Kosinus_am_Einheitskreis_1.svg  

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