![]() ![]() Sometimes 20 years will elapse between the appearances of super blue moons. But a supermoon that’s also a blue moon? That’s a much rarer beast. Another four will appear from August through November of next year. This week’s is the third one of the year, with a fourth one on tap for Sept. About 25% of all full moons are supermoons, NASA says. Comparing its size to smaller surface features like houses and trees makes the lunar disk look far larger still.įor all of the hoopla created by supermoons, they’re actually quite common. The phenomenon is especially striking when the moon is close to the horizon, where it benefits from an optical illusion. A full moon at perigee appears 14% larger and 30% brighter than a full moon at a more distant remove. But when it is a full moon, things are different. ![]() That difference doesn’t show itself much when a moon is a mere crescent. Instead the moon’s orbit is elliptical, with its closest approach to Earth-or perigee-measuring 357,000 km (222,000 miles) compared to an apogee-or farthest approach-of 406,000 km. ![]() That kind of explosive release of energy was not likely to lead to a tidy, circular orbit-and it didn't. About 4.5 billion years ago, a small, Mars-sized planet collided with the infant Earth, sending up a cloud of debris from both worlds that eventually coalesced into the moon. Read More: How India Became the First Country to Reach the Moon's South Pole But then there’s the “supermoon” label to consider too. Only 3% of full moons are blue moons, according to NASA, so tonight’s moon would be noteworthy no matter what. 1, so tonight’s full moon comes in just under the wire to qualify for the blue distinction. Instead, the label– whose provenance is unsettled-refers to the second full moon in any single month. For starters there is nothing remotely blue about the way the moon will look tonight. Municipalities on boundary line - All municipalities located upon the zone boundary line described in this section are in the central standard time zone.The ”super blue moon” label requires a little unpacking. Then southerly along the Utah-Nevada boundary, the Nevada-Arizona boundary, and the Arizona-California boundary to the boundary between the United States and Mexico. Then westward along the northern, western, and southern boundaries of the City of West Wendover back to the Utah-Nevada boundary. Utah-Nevada-Arizona-California - From the northeast corner of the State of Nevada southerly along the Utah-Nevada boundary to the junction with the northern border of the City of West Wendover, Nevada. thence east to the Idaho-Oregon boundary thence south along that boundary to the southwest corner of the State of Idaho thence easterly along the Idaho-Nevada boundary to the northeast corner of the State of Nevada. thence westerly along the north line of Malheur County to the northwest corner of Malheur County thence southerly along the west line of Malheur County to the southwest corner of T. Montana-Idaho-Oregon - From the junction of the Idaho-Montana boundary with the boundary between the United States and Canada southerly along the Idaho-Montana boundary to the boundary line between Idaho County, Idaho, and Lemhi County, Idaho thence southwesterly along the boundary line between those two counties to the main channel of the Salmon River thence westerly along the main channel of the Salmon River to the Idaho-Oregon boundary thence southerly along that boundary to the boundary line between Baker County, Oreg., and Malheur County, Oreg. ![]()
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