Vocab
trend of the Earth's motion
What is diurnal motion?
The darker shadow of the moon
What is the umbra?
These two seasons have the longest days
What are spring and summer?
Type of path in which the planets orbit the sun
What is elliptical?
concept that is useful for understanding the positions and motions of stars
What is celestial sphere?
This leaves behind debris that results in meteor showers
What are comets?
Stars rise ______ hours earlier every month and ______ hours earlier after six months
What is 2 and 12?
Equatorial coordinates are based on this
What is the celestial sphere/celestial equator?
This means equal night
What is equinox?
When a planet is behind the sun
What is conjunction?
The moon rises approximately __________ later each day
What is 50 minutes?
The combination of these two things make the motion of the planets complicated
What are their true motion of the sun and the apparent shift in position due to Earth's motion around the sun?
The type of constellations close enough to the celestial pole that they are visible all night, year-round
What are circumpolar constellations?
Thin ring that is left when the moon passes directly in front of the sun
What is the annulus?
This meteor shower occurs around August 12 each year
What is the Perseid meteor shower?
On a planisphere, these two things need to be lined up to find stars?
What are date and time?
This means sun stop
What is solstice?
The figure-eight shape the sun traces out across the sky each day
What is analemma?
The phenomenon in which the constellation found with the sun and equinox shifts with time
What is the precession of equinoxes?
This cycle has the sun, moon, and Earth the same every 18.031 years
What is the Saros?