Hank explores the science behind the first kiss -- and all the kisses that come after it -- and also sets you straight about the vernal equinox, what it is, and why this year's is special!

Howcast - The vernal equinox is one of two days during the year when day and night are of equal length. Here are some ideas rooted in ancient traditions to celebrate it.

The earth takes one year to orbit the sun but we can measure the length of a year in several ways. If I were to ask (and I do) how would you measure the length of a year? In reference to distant stars? By the time between two closest...

Can you balance an egg on the equinox? Yes, but it's a myth that implies that that is the only time you can do it. You can balance an egg on any day of the year. It's about practice, patience, and what kind of tabletop you are trying to...

What is Saturnalia? You may have heard of this Roman holiday, but the details are scant and fragmentary from Roman sources. This video explains what we know about Saturnalia and whether or not it influenced the institution of Christmas.

The orbit of Earth on a tilted axis around the sun leads to the seasons. The resulting change of angle of the sun, and length of day controls how warm we get at different times of the year. With those changes in seasons come changes in...

This public radio story describes the Julian calendar, developed during the rule of Julius Caesar in Rome in the first century BCE, and how this calendar failed to keep accurate time for the Catholic Church centuries later. You will hear...

The orbit of Earth on a tilted axis around the sun leads to the seasons. The resulting change of angle of the sun, and length of day controls how warm we get at different times of the year. With those changes in seasons come changes in...

This live-action video program is about the word equinox. The program is designed to reinforce and support a student's comprehension and retention of the word equinox through use of video footage, photographs, diagrams and colorful,...

This video provides an explanation of the solstices and equinoxes, which are important astronomical events that mark the changing seasons.<b<br/>r/>

This video is part of the 8-part series, Earth’s Rotation and Revolution.

The orbit of Earth on a tilted axis around the sun leads to the seasons. The resulting change of angle of the sun, and length of day controls how warm we get at different times of the year. With those changes in seasons come changes in...

The orbit of Earth on a tilted axis around the sun leads to the seasons. The resulting change of angle of the sun, and length of day controls how warm we get at different times of the year. With those changes in seasons come changes in...

The orbit of Earth on a tilted axis around the sun leads to the seasons. The resulting change of angle of the sun, and length of day controls how warm we get at different times of the year. With those changes in seasons come changes in...

The orbit of Earth on a tilted axis around the sun leads to the seasons. The resulting change of angle of the sun, and length of day controls how warm we get at different times of the year. With those changes in seasons come changes in...