Astronomy - Ch. 6: Telescopes (8 of 25) Finding Diameter=? of Craters on the Moon

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In this video I will find the diameter of a crater on the Moon given the diameter of the telescope lens.

[@MichelvanBiezen]

Jianghsi
Yes, you can solve for the size of the crater if you know the distance to the Moon and the size of the objective mirror.

[@richardw2977]

Thank you for helping demystify the calculations and what the mean from a practical sense.

[@YelenaIzKislovodska]

Hello! can you guide us with a link where you talk about the second equation? (d over D one ?) would be so helpful !

[@puriap250]

Very interesting and informative as always.

[@MichelvanBiezen]

Glad you think so!

[@adriantee5219]

Where does the value 57.3 come from?

[@ahmetcemkutluay2172]

(angle(in degree) *pi ) / 180 = angle(in radian) , and by small angle approximation, we can assume tan(angle)=d/D=angle

[@lightweightbaby7959]

sir, where's the 2.5 e5 from?

[@MichelvanBiezen]

2.5 x 10^5 = 57.3 x 3600 x 1.22 = (degrees in 1 radian) x (arc seconds in 1 degree) x (diffraction constant for circular apertures).

[@lightweightbaby7959]

Michel van Biezen thank you so much sir, appreciate that

[@StorytimeLullabies]

@@MichelvanBiezen what is the 1.22

[@gloomy5487]

@@StorytimeLullabies diffraction constant for circular apertures.