Q: How often do two blue moons occur in a year?
A: Only three or four times per century.
Q: How often does a blue moon occur?
A: Once every 2 1/2 years.
Q: What is a blue moon?
A: The second full moon in the same month.
Q: How hot is the surface of the sun?
A: About 11,000 degrees.
Q: Earth's seasons are due mainly to what?
A: Earth's seasons are due to its 23.5 degree axis tilt.
Q: How fast does a medium speed meteor travel across the sky?
A: About 27 miles per second.
Q: What solar cycle started in January 2008?
A: Solar cycle 24.
Q: How far away is the sun?
A: On average, 92,955,807 miles.
Q: When is the sun farthest south in the Southern Hemisphere?
A: Winter solstice, which is on or around Dec. 21.
Q: How long is the sun up on June 22 in Sacramento?
A: 14 hours and 51 minutes.
Q: How long is the sun up in Sacramento on Dec. 22?
A: Nine hours and 28 minutes.
Q: What is civil twilight?
A: The time period when the sun is no more than 6 degrees below the horizon.
Q: How long is the sun up in Anchorage today? (Dec. 1)
A: Only 6 hours and 7 minutes.
Q: What kind of radiation does the sun emit the most of?
A: Visible light. Among others, it also emits ultraviolet radiation.
Q: How many hours of sunlight does the North Pole see on June 21?
A: 24
Q: How many hours of daylight do we see on the equinox?
A: 12 hours.
Q: Why is the moon larger when it is on the horizon?
A: It actually isn't. Your brain is actually tricking you.
Q: What kind of radiation does the sun emit the most of?
A: Visible light. Among others, it also emits ultraviolet radiation.
Q: How much of the Earth is covered in water?
A: About 70 percent of Earth's surface is covered in water.
Q: Which solar phenomenon produces the aurora?
A: The solar wind.
Q: How much of the Earth is covered in permanent snow and ice?
A: About 12 percent of Earth's land surface.
Q: Without sunscreen and a UV index of 5, how fast can you get a sunburn?
A: About 30 minutes.
Q: A parhelion is also known as what phenomenon?
A: It is also called a sundog.
Q: If you are staring at a rainbow, where is the sun?
A: Behind you.
Q: Solar activity cycles every how many years?
A: Every 10 or 11 years.
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