How much of the solar system's mass is in the Sun?
The Sun contains about 99.8% of all the mass in our solar system.
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- What is the solar cycle?
“The Sun goes through a cycle of about 11 years in which its activity rises and falls.”
Reference: NASA
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What is the altitude of the sun relative to Earth ?
The altitude of the sun varies throughout the year. On December 21st (sometimes the 22nd) the sun is 20 degrees above the horizon, it's lowest point of the year. On June 21st (sometimes the 20th) the sun is 65 degrees above the horizon, it's highest point of the year.
Do you know what days these are? They are the winter & summer solstice.
How long does sunlight take to reach Earth?
Sunlight takes about 8 minutes and 20 seconds to reach Earth, so we always see the Sun as it was a few minutes ago.