OTD 30.12 December 30th Traditional Cache

OTD - 30:12 

Perhaps you want a smiley for every day of the year or maybe a birthday smiley. For whatever reason these 12 mini monthly power trails are here to be found. Most are easily located, with an occasional sneaky one in the mix, sat lock can be difficult in some areas.

Here are some facts for this day. You are welcome to log your interesting, quirky or fun fact/s with your log.

On This Day - December 30th 1982

A blue moon occurs simultaneously with a lunar eclipse. 

A "blue moon" does not refer to the colour of the moon at a particular stage in its cycle: it means the second in a pair of full moons that occur in the same calendar month. A blue moon happens every 2.7 years and is due to a disparity between the Gregorian calendar and the lunar cycle. The lunar cycle, the time it takes for the moon to revolve around the earth, does not take 28 days, but takes 29 days, 12 hours, and 44 minutes. During the twentieth century, there were a total of 44 blue moons.

On 30 December 1982, a blue moon occurred in conjunction with a total lunar eclipse. This was the only time this happened in the twentieth century, although a blue moon did occur in conjunction with a partial lunar eclipse on three other occasions. It was also a perigee lunation, which occurs when the Moon is at or near its closest approach to Earth.