Using the formula for central angle for radiation, S = rθ , where S is the diameter of the sun and r is the distance between the sun and the earth.
Distance, r: r = 150 million km = 1.50 × 10-2 × 106 × 103 m
r = 1.50 × 107 m
S = (0.5° × (π rad)/180°)(1.50 × 107 m) = 1.309 × 106 m
The Sun subtends an angle of about 0.5 degrees to us on Earth, 150 million km away. Estimate the radius of the Sun?
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