Kettner's Science Class
By: Aisley Niles

Define waxing- The moon at anytime after new moon and befoe full moon, so called because it's illuminated area is increasing.

Define waning- The moon at anytime after full moon and before new moon (so called because it's illuminated area is decresing).

Define gibbous and crescent- Gibbous is having the observable illuminated part greater than a semicircle and less than a circle. the crescent is a curved shape of the waxing moon.

Pattern between waxing, waning moon- As the Earth and moon orbit the sun together, the pattern of the day and night on the lunar surface constantly changes.

Define lunar cycle, how long it is- Metonic cycle. 29.53059

Earth's seasons/Eclipses

Who was Copernicus- He was a renaissance mathematician and astronomer who formulated a model of the universe that placed the sun rather than the Earth at it's center.

Why do we have seasons? We experience seasons because the Earth rotates on an axis that's tilted in it's orbits. That 23.5 degree tilt causes the different hemispheres to be at different angles to the sun at different time of the year.

Winter, summer- During the summer, the sun's rays hit the Earth at a steep angle. The light does not spread out as much, thus increasing the amount of energy hitting any given spot. Also, the long daylight hours allow the Earth plenty of time to reach warm temperatures.

Lunar eclipses- The phase known as New Moon can not actually be seen because the illuminated side of the moon is then pointed away from Earth.

How come we have day/night- Earth's rotation occurs from west to east, which is why the sun always appears to be rising on the eastern horizon and setting on the western.

Define- Equinox- The time of date at which the sun crosses the celestial equator.

Define Solstice- When the sun reaches it's highest or lowest point in the sky at moon, marked by the longest and shortest days.