Todays Topics:

TidesEclipse of Sun and MoonOther Celestial Bodies The GalaxyThe ConstellationThe Earths MovementEvidences of Rotation of EarthEvidences of Earths Revolution

NatSci 1- Astronomy

Tides:

The Forces Working together from the moon and earth create two maximum tidal bulges diametrically sides of the earth. During this 24 hour period Locations on Earth passes through high and low positions. At this time earths rotation to the moon then moves slightly pass the position of the earth creating the variation of tides from day to day.

NatSci 1- Astronomy

Spring Tide

occurs when the sun and moon are in line with the earth. These are highest tides which happens twice each month during the full moon and new moon.

NatSci 1- Astronomy

Neap Tides or Minimum Tides

occurs when sun and moon are at 90 degrees to each other. The tide happens during the first and third quarter moon.

NatSci 1- Astronomy

Solar Eclipse

this happens during daytime. It occurs when the earth intersects the umbra part of the moons shadow.

NatSci 1- Astronomy

Lunar Eclipse

Happens During the Night. During Full moon the earth is between the sun and moon. The earth blocks the light from the sun and casts its shadow on the moon.

NatSci 1- Astronomy

The Galaxy

Galaxy is the Composition of all individual stars including the sun which is 100 billion stars.Galaxy contains a number of Gas and Dust Clouds called Nebulae.

Closest Galaxy: Andromeda Galaxy

NatSci 1- Astronomy

Constellation

This is the Star Patterns and are identified by their ancient names.

EARTHS MOVEMENT

The Earth move in two ways:It spin on its Axis called RotaionGoes around the sun called Revolution.

Evidences of Earths Rotation:

Natural Sceince 1 Lecture Module

Pages 87 to 89

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