# Physics parallax trigonometry?

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#1
Hi People,
I'm currently doing my further science P7 GCSE OCR 21st century science But I'm stuck on the parallax trigonometry I understand trig in maths, SOHCAHTOA. However I don't understand ARC seconds and why you need to convert it into these. Can somebody help by giving an example question
-Thank you...
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6 years ago
#2
Moved to Physics for you
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6 years ago
#3
Hi People,
I'm currently doing my further science P7 GCSE OCR 21st century science But I'm stuck on the parallax trigonometry I understand trig in maths, SOHCAHTOA. However I don't understand ARC seconds and why you need to convert it into these. Can somebody help by giving an example question
-Thank you...
Welcome to TSR and the physics section.
I think you need to be a bit more specific in your question.
Convert what?

I can tell you that seconds are just what you divide a minute into. The same as time.

A degree has 60 minutes.
So 2.5 degrees (two and a half) would be 2 degrees 30 minutes.

Half a minute would be 30 seconds.
Clearly seconds are very small angles.

Parallax angles are very small so measuring them in minutes and seconds shouldn't seem strange.
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