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