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What do we know?
• Focal length of the telescope,
• the distance from the Earth to the Moon is 384,444 km
• Two formulas: and

What do we have to find out?
• We'd like to work out the Moon's diameter, D, this being twice the radius, R.
Work out
• With the programm SalsaJ, open the photos below and measure diameter's moon (mm). We'll call this value “u”. The scale of each photo is below them.

Escala:                                 0.06 píxel/Km.                                1.15 píxel/Km.

• The focal lenght of the telescope is , so we can claculate s using the formula .
• Find out the angular diameter with , since we know u and s.
• Transform this value into radians (just multiply it by 0.0174
• Since we know that the distance from Earth to Moon is roughly 384,444 km, we can find out Moon's diameter, D, from y r (the distance from we to the object.

solucion_diametro_focal_de_un_telescopio_ingles.1241279317.txt.gz · Última modificación: 24/04/2017 13:16 (editor externo)