Astronomy 90

Scientific notation: Positive ———

Scientific Notation: Positive = numbers that were larger than 9.99

Scientific Notation: Negative = ———

Scientific Notation: Negative = Numbers that were smaller than 1

What is astronomy?

Astronomy is the study of objects and phenomena in space.

What are celestial bodies?

Celestial bodies are all objects we can observe in the night sky.

Most visible constellations are:

Most visible constellations are stars

Some stars are grouped as:

Some stars are grouped as patterns.

Constellations:

Groups of stars as seen from Earth that resemble a form

Asterisms:

Smaller patterns within constellation (Big Dipper)

Astronomers have created ____ to keep track of ____

Astronomers have created calendars to keep track of time, using celestial motion.

____ and ____ help us determine when the seasons change.

equinoxes and solstices help us determine when the seasons change.

____ in ____ allow us to communicate globally.

Satellites in orbit allow us to communicate globally.

____ allow us to track ____.

GPS satellites allow us to track position.

What calendar are we currently using?

We are currently using the Gregorian calendar put in place by Pope Gregory in 1582.

Solstices are:

Longest and shortest days of the year.

Equinoxes are:

When night and day are the same length

Both ____ and ____ are caused by the tilt of the earth

Both solstices and equinoxes are caused by the tilt of the earth.

Navi: ____ was used during the day and ____ during the night

Sun was used during the day and stars during the night

Polaris (____) was often used because it never ____

Polaris (north star) was often used because it never moves.

____ and ____ were tools that made this process a lot more exact.

Quadrants and sextants were tool that made this process a lot more exact.

Zenith: Point directly ____ the observer.

Point directly above the observer.

Altitude: Measured from the ____ up to the ____

Measured from the horizon up to the star.

Azimuth: Measured from ____ to the ____

Measured from north clockwise to the star.

Right Ascension and Declination: Like ____ and ____

Like longitude and latitude.