Earth And Sun Shadow Study Astronomy

Earth And Sun Shadow Study Astronomy

In this lesson we study about Earth And Sun Shadow Study Astronomy.


In what two major ways does Earth move in?

Rotation
Revolution


Axis

The imaginary line that passes through an object’s center.
It goes through the North and South poles.


Rotation

The spinning of an object around its axis


Revolution

The movement of one object around another
AKA orbit


Calendar

The system of organizing time that defines the beginning, length, and divisions of a year.


Our common calendar is divided into…

Years, Months, and Days


Why does Earth have seasons?

Because its axis is tilted as it revolves around the sun


Solstice

The two days on which the sun reaches its greatest distance North or South of the equator


When are the solstices?

21 June
21 Dec


Equinox

The two days in which night and day are both roughly 12 hours each


When are the equinoxes?

21 March
22 September


As the moon revolves around Earth, the amount of sunlight on the moon’s surface..

Stays the same


Eclipse

When an object in space comes between a sun and a third object, casting a shadow on the third object


Solar Eclipse

When the moon passes directly between Earth and the sun, blocking sunlight from Earth.
The moon’s shadow then hits Earth


The moon’s orbit is ___ with respect to Earth’s orbit around the sunl.

Slightly tilted


Umbra

The darkest part of a shadow
Within the umbra the light is completely blocked


Penumbra

The larger part of the shadow
Part of the sun is still visible


Lunar Eclipse

Occurs when the moon is at a full moon and Earth is directly between the moon and the sun.
Earth blocks sunlight from reaching the moon


Tides

The rise and fall of ocean water that occurs every 12.5 hours
The water rises for about 6 hours, then falls for about 6 hours


Tides are caused by

Differences in how much gravity from the moon and the sun pulls on different parts of the Earth


Even though the sun is about ___ from Earth, because it is so massive its gravity affects tides

150 km


Changes in the position of Earth, the moon, and the sun affect ___ of the tide

the height


Spring Tide

The greatest distance between consecutive low and high tides.
Caused by the sun and moon’s gravity on the oceans


How often does it happen?

Twice a month


Neap tide

The least amount of difference between consecutive low and high tides when the moon is at a right angle to the sun.


How often does it happen?

Twice a month


Total Eclipse (Solar)

Moon is closest to Earth
You don’t see the sun at all


What part of the shadow are you in?

Umbra


How much do you see of the sun?

Nothing


Partial Eclipse (Solar)

Moon is closest to Earth
You see partial sun


What part of the shadow are you in?

Penumbra


How much do you see of the sun?

Partial sun


Annualar Eclipse (Solar)

Moon is the farthest away from Earth
You see a ring of sun around the moon


.

Order of celestial bodies

Sun, Moon, Earth


What casts shadow on what?

Moon casts shadow on Earth


During day or night?

Day


Order of celestial bodies

Sun, Earth, Moon


What casts shadow on what?

Earth casts shadow on Moon


During day or night?

Night


Homepage