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www.reference.com/article/valentine-s-day-trivia-quizzes-b175b7661d3ee676

Quiz Rocket and Trivia Park have Valentine's Day trivia quizzes on their websites, as of 2015. The questions typically deal with the history of the celebration. Brownielocks and Examiner.com have trivia questions on common Valentine's Day symbols, such as flowers, candies and couples.

www.reference.com/article/earth-s-motion-causes-day-night-5ac8dc3eeb87aa5

The spinning and rotating movement of the earth along its vertical axis causes the difference between day and night. The differences between light and darkness on the earth's surface are caused primarily by the earth’s rotation along a vertical axis. This constant spinning motion accounts for hourly

www.reference.com/article/day-opposite-day-59c7fd650fb314ea

"Opposite Day" is not an officially recognized holiday. There are some references to "Opposite Day" being on January 25. Generally, "Opposite Day" is simply declared on any day, and it begins whenever the starter says so.

www.reference.com/science/planets-shorter-days-earth-914cc1862a8cd081

The outer planets Jupiter, Saturn, Uranus and Neptune all have shorter days than Earth. Among the terrestrial planets, Mars has a slightly longer day than Earth at 24 hours 37 minutes. Mercury's day lasts 59 Earth days, while a day on Venus lasts 243 Earth days.

www.reference.com/article/earth-length-days-nights-equal-46bc36c87a1c1cd2

The length of days and nights are approximately 12 hours each in areas located on the equator. The equator is an imaginary line that runs around the Earth at 0 degrees latitude. It separates the planet into the North and South Hemispheres.

www.reference.com/article/day-labor-day-cdda57322fb02ac1

Labor Day occurs on the first Monday of September, regardless of the date. The first Labor Day was initially celebrated on a Tuesday, on Sept. 5, 1882, by a labor union in New York City. On June 28, 1894, Congress passed an act declaring Labor Day a national holiday.

www.reference.com/article/day-veterans-day-58d2b44c09466042

Veterans Day is an American federal holiday celebrated each year on November eleventh. The day honors those who have served in the United States military.

www.reference.com/article/many-times-day-lightning-hit-earth-b984b64e417483bc

With an average of 2,000 active thunderstorms occurring at any given time, lightning strikes occur an average of 100 times a second. With an estimated 20 percent of strikes being cloud-to-ground, lightning hits the Earth approximately 432,000 times every day.

www.reference.com/article/day-squirrel-appreciation-day-c272fd0459eaf759

Squirrel Appreciation Day is on January 21 of every year. The first instance of this holiday was in 2001, and it was begun by Christy Hargove from Asheville, North Carolina.

www.reference.com/science/many-times-per-day-lightning-strike-earth-66d5e236ffaa2aca

Lightning strikes reach the ground on Earth as much as 8 million times per day or 100 times per second, according to the National Severe Storms Laboratory. Out of all the lightning strikes in the world, the United States accounts for about 20 million of the total number of lightning strikes each yea