Latitude
This is the longest line of latitude.
What is the Equator?
Zero degrees longitude is called this.
What is the Prime Meridian?
You have to know these two things in order to calculate a location's photoperiod.
What are sunrise and sunset times?
North of the Tropic of Cancer, the sun is out the longest and the highest in the sky on this day.
What is June 21?
One of the reasons we have seasons is what happened to the Earth when the Moon was made.
What is a 23.5 tilt to Earth's 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 direct sunlight on December 21.
What is the Arctic Circle?
On these two days, the photoperiod is essentially the same on every location on Earth.
What are the Vernal Equinox (March 20) and the Autumnal Equinox (September 20)?
This is the other thing the Earth does that creates seasons.
What is orbit 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?
On June 21, the sun is directly overhead at noon 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)?
The Earth's northern hemisphere receives more sunlight than its southern hemisphere between these two dates.
Lines of latitude serve this purpose.
What is show how many degrees north or south of the Equator a location is?
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 date.
What is June 21 (the summer solstice)?
This is the reason the northern half of the Earth is warmer during the summer months.
The north pole is tilted towards the Sun; the days are longer; the angle of the sun is higher.
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 these lines has a different photoperiod.
What are the lines of longitude?
These things happen on March 20, June 21, September 20, and December 21.
What are the first days of spring, summer, fall, and winter (northern hemisphere) OR fall, winter, spring, and summer (southern hemisphere)?
Either one of these two things would prevent the Earth from having seasons.
What is not orbiting the Sun OR having a zero degree tilt?