The Moon at Perigee

The Moon at Perigee

The Moon’s orbit around Earth is elliptical. The point of the orbit closest to Earth is called perigee, while the point farthest from Earth is known as apogee.

The Moon reaches perigee, the closest point in its orbit to Earth, tonight at 10:42 pm when it will be just 357,838 kilometres away.

The difference between apogee and perigee.

The Moon’s orbit around Earth is elliptical, with one side closer to Earth than the other.

Consequently the Earth Moon distance varies throughout the month and year. On average, the distance is about 382,900 kilometres measured from the centre of the Moon to the centre of the Earth.

The point on the Moon’s orbit closest to Earth is called the perigee and the point farthest away is the apogee.

The Moon’s gravitational pull causes tides.

The greatest difference between high and low tides occur around the Full and New Moon. These are known as spring or king tides. During these Moon phases, the gravitational forces of the Moon and the Sun combine to pull the ocean’s water in the same direction.

Perigean spring tides are around 5 cm larger than regular spring tides, while apogean spring tides are around 5 cm smaller than normal spring tides.

Donna the Astronomer

I am a keen astronomer lucky enough to live and work in Coonabarabran the Astronomy Capital of Australia! I am a ‘Drover’s Brat’ and discoverer of a couple of comets and asteroids. I operate Milroy Observatory and can show you how to best integrate dark sky experiences into your tourism, farm stay or AirBnB business.

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