2. What’s Up With the Weather?
Created by
Dr. A. Dávila

3. Autumnal Equinox

6. Equinox
(direct rays)

9. The Big Dipper isn't really a constellation
The Big Dipper isn't really a constellation? It's an asterism, which is a special, recognizable group of stars.
The star Polaris is in another constellation called the 'Little Bear', or Ursa Minor.

10. The picture is seen from above, turned on its side
The picture is seen from above, turned on its side. The north rotational pole of the earth points toward Polaris. But this star is 300 light years from Earth, or about 3000 trillion kilometers, or 3,000,000,000,000,000 km

12. Sun rays directed toward the southern
hemisphere (winter solstices)

15. Sun rays directed toward the northern
hemisphere (summer)

18. Equinoxes
Equinoxes are days in which day and night are of equal duration. The two yearly equinoxes occur when the Sun crosses the celestial equator.

19. Equinoxes
The autumnal equinox occurs on September 22 or 23 (this is the beginning of fall in the Northern Hemisphere and the beginning of spring in the Southern Hemisphere).

20. Equinoxes
The vernal equinox occurs on March 20 or March 21 (this is the beginning of spring in the Northern Hemisphere and the beginning of fall in the Southern Hemisphere).

23. Varying Seasons Birthdays

24. SPRING begins
March 20

25. SUMMER begins
June 20

26. WINTER begins
December 21

27. AUTUMN begins
September 22

28. December 21
March 20
September 22
June 20

29. Night-time
Daylight

30. Night-time
Daylight

31. Daylight and night-time are the same (equinox)