How many degrees of arc is the width of the solar disk in Mercury's sky? Could you see solar flares (with protection) without lenses?
- billrussell42Lv 72 months agoFavorite Answer
Aphelion 69,816,900 kmPerihelion 46,001,200 km
Mean radius 2,439.7 km
SunMean radius 696,392 km
mean distance mercury to sun is average of Aphelion and Perihelion
which is about (69.8+46)/2 = 57.9e6 km
need to subtract radius of mercury to get surface distance to sun
57.9e6 km – 2000 km = 57.9e6 km
so the sun subtends 696e3 km at a distance of 57.9e6 km
using trig, half the angle = arctan (696e3/(0.5)57.9e6)) = 1.38º
twice that is 2.75º
as to visibility, some are visible on earth to the naked eye, so certainly even more would be visible on mercury.
- CarolOklaNolaLv 72 months ago
2.5 times as seen from Earth. The Sun's width is an average of 30 seconds of SRC, so 3.5 time would be 1.5° degrees of adv. 1° = 60 minutes.
I used the AVERAGE diameter of the Sun. The Sun can be 34' wide from Earth because the distance of Earth from the Sun varies by 5 million kilometers, 3.8 million miles.
No, you would NOT be able to see solar flares without lenses or filters.