Explains the science of the autumnal equinox and how harvest have been celebrated by different cultures throughout history. Includes activities and ideas for celebrating in school and at home.

"Simple rhyming text and color photographs present seconds as a unit of time"--

When Meg Murry, joined by her brother Charles Wallace and friend Calvin, embarks on a journey to save her father from an intergalactic source, they come under the guidance of three celestial beings as they travel from one side of the universe to the other.

Learn about space and time through facts focused on percentages. Did you know that only 10% of the Universe's galaxies can be seen by scientists, 90% still cannot be seen by today's telescopes? Find out about the objects zooming around the Solar System. The Big Bang, the Milky Way, black holes, dark matter are some of the topics covered in this exciting new way of exploring space and time.

An introduction to the days of the week.

An introduction to time discusses the inventions and communication used to tell time throughout history, including hour glasses and atomic clocks to calendars and chronometers.

"Learn all about how crops are picked and get to the store for us to eat. Color photographs and easy-to-read text tell kids about harvest time in the season of fall"--Provided by publisher.

"Real-world examples and engaging activities guide readers in learning about measuring time with a calendar."--

"Time is measured in a variety of units, including seconds, hours, days, weeks, and decades. This practice began with the sundials of ancient Egypt, but we still use clocks and calendars today to keep track of our time. This volume guides readers through measuring time, figuring out time zones, and learning about classic and modern timepieces. Through a fun activity and introductions to some famous scientists, readers will gain a better understanding...