'Supermoon': Where, When & How to Watch It [PHOTOS]

Sky gazers and watchers alike may ready their calendars for date circling.

Three "Supermoons" will be appearing this year - and tonight, the first one will make its debut.

The term "Supermoon" refers to what astronomers call a "Lunar Perigee."

The term means "a full moon that coincides with the closest point of the moon's orbit to the earth," as told by the Christian Science Monitor.

According to Hawaii's Bishop Museum, as the moon's orbit or path around the Earth is elliptical, it can be as close  as 225,600 miles from us or as far as 252,000 miles.

When the moon is at the closest point to earth in its monthly path around the earth it is said to be at 'perigee.'

According to the Bishop Museum, the moon this time will be a little closer to the Earth in comparison to the average moon, ergo slightly bigger and brighter.

"A supermoon is a just a full moon that occurs in the same day that the moon is at perigee. Since it's a little closer than usual, the moon appears a little large than a 'normal' full moon. The astrologer who coined the term 'supermoon' actually uses the term in reference to both new moons and full moons that occur near perigee," wrote the Bishop Museum.

NASA furthers that it is not always easy to tell the difference between a full moon and a "Supermoon."

"A 30 percent difference in brightness can easily be masked by clouds and haze.  Also, there are no rulers floating in the sky to measure lunar diameters. Hanging high overhead with no reference points to provide a sense of scale, one full Moon looks about the same size as any other," NASA explained.

TimeandDate.com says that the best time to see the Supermoon is at moonrise when the moon is just above the horizon.

The moon "will look bigger and brighter than when it is higher up in the sky, because observers are able to compare the apparent size of the Supermoon with elements in the landscape - hills, foliage and buildings," writes TimeandDate.com. 

Details on the Supermoon on the night of August 29 has  been provided by the Bishop Museum:

The moon is officially full at 6:26 p.m. HST on the night of August 29, just 30 minutes before the moon rises that night around 7 p.m.

The succeeding Supermoons will take place on September 28 and October 27.