Answer:
The time it takes to revolve around the sun in a year. It takes Earth 365 days plus 1/4. After you add up 4 years, you will earn that extra day.
Explanation:
<span>An encyclopedia entry is an example of a tertiary source. Unlike primary sources, which contain original thought and research, and secondary sources, built on a writer's or editor's interpretation of information in primary sources, encyclopedia entries are reports about a subject that can include information from both primary and secondary sources.</span>