The Full Moon last week was called a “supermoon” because it was closer to Earth and so looked a bit larger. Tonight is the New Moon – the “invisible” Moon – and some people have given this one the name “Micromoon.” Both terms are not scientific or official and only came into being in recent times.
A Micromoon is when a Full Moon or a New Moon coincides with apogee, the point in the Moon’s orbit farthest away from Earth. I have also seen it called Minimoon or Apogee Moon. It is considered to be “micro” Full Moon or New Moon when the Moon’s center is farther than 405,000 kilometers (ca. 251,655 miles) from the center of Earth.
Will it really look different? A Full Micro Moon will look approximately 14% smaller than a Supermoon and the illuminated area appears 30% smaller, so it might look a little less bright. Of course, a Micro New Moon – like all New Moons – is not lit for us to see, so it being farther away will not have any effect on what we see – or more accurately, don’t see.
Even unseen, the New Moon still affects tides which shows the greatest difference between high and low tides around a Full Moon and a New Moon. Micromoons mean a smaller variation of about 5 cm (2 inches).
Moon lore suggests that Full Moons, New Moons, Micromoons, and Supermoons affect human mental health. It was also believed that they also could create natural disasters, such as earthquakes, because of the pull of the Moon and Sun in the way that it affects tides. No scientific evidence supports these kinds of correlations.