Latitude
This is the longest line of latitude. It also has zero degrees!
What is the Equator?
Zero degrees longitude is called this.
What is the Prime Meridian?
These two things are essential to know about a location in order to calculate its photoperiod for any particular day.
What are the times of sunrise and sunset?
The Sun out the longest and highest in the sky on this day.
What is the summer solstice (on June 21 in the northern hemisphere)?
One of the reasons we have seasons is what happened to Earth when the Moon was made.
What is it has a 23.5 degree tilt to its axis?
Lines of latitude never do this.
What is touch or cross each other?
All lines of longitude touch in these locations.
What are the North Pole and the South Pole?
All points north of this line receive no sunlight on December 21.
What is the Arctic Circle?
On these two days, the photoperiod is essentially the same in every location on Earth.
What are the vernal equinox and the autumnal equinox (March 20 and September 20 in the northern hemisphere)?
This is the other thing that the Earth does that creates seasons.
What is orbit around the Sun?
Lines of latitude go as high as this number of degrees.
What is ninety (90)?
Lines of longitude are farthest from each other at this location.
What is the Equator?
The sun is directly overhead at noon on June 21 on this line of latitude.
What is the Tropic of Cancer (23.5 degrees north)?
In the northern hemisphere, the shortest photoperiod and the lowest angle of the Sun happen on this day.
What is the winter solstice (December 21)?
Earth's northern hemisphere receives more sunlight than the southern hemisphere between these two dates.
What are March 20 and September 20?
Lines of latitude serve this purpose.
What is show how many degrees north or south a location is from the Equator?
Lines of longitude help you to know this about a location.
What is how many degrees east or west a place is from the Prime Meridian?
The Sun is directly overhead at noon on this line on December 21.
What is the Tropic of Capricorn (23.5 degrees south)?
In the northern hemisphere, the longest photoperiod and the highest angle of the Sun happen on this day.
What is the summer solstice (June 21)?
This is the reason the northern half of the Earth is warmer during the summer months.
What is the northern axis's tilt toward the Sun.
Lines of latitude are also known as these.
What are "parallels?"
Lines of longitude are also known as these.
What are "meridians?"
With the exceptions of March 20 and September 20, every location along this line has a different photoperiod.
What is the Prime Meridian (or any line of longitude)?
These things happen on March 20, June 21, September 20, and December 20.
What are the first days of spring, summer, fall, and winter in the northern hemisphere? What are the first days of fall, winter, spring, and summer in the southern hemisphere?
Either one of these two things would prevent the Earth from having seasons.
What is no longer orbiting the Sun OR not having a 23.5 degree tilt to Earth's axis?