The 20th of March 2026 represents the:

Why does Earth experience seasons?

During which Earth-Sun position (or positions) does the Equator (0 degrees latitude) receive the most direct insolation from the Sun (also known as the most direct Sun’s rays, overhead Sun, and subsolar point)?

If it is 3:00 pm, Monday in London (0 degree central meridian), then what time and day is it in Shanghai (120 degrees E central meridian)?

 The ——– is the most accurate measurement of gestational age during the first trimester and should be recorded when an embryo is present

Please use the World Time Zone Map below to answer the following time zone calculation questions.  Remember to add hours when traveling east (left to right on the map), and subtract hours when traveling west (right to left on the map).  Add or subtract one hour for every 15 degrees of longitude.  You can physically count hours on the map, or calculate the total difference in longitude between two locations and then divide the total longitude difference by 15.  Please refer to the examples provided in the instructions above. Use the following World Time Zone Map below to answer the questions below:

When does the Antarctic Circle (66.5 degrees S latitude) experience 24 hours of daylight?

From the perspective of a vertical orientation, how many degrees is Earth tilted on its rotational axis?

What is the lowest known point on Earth’s surface?  Note that it is below sea level and may be within the ocean.

If it is 7:00 pm, Saturday in Tokyo (135 degree E central meridian), then what time and day is it in San Salvador (90 degree W central meridian)?