"Sometimes during the year we get an opportunity to see the full moon when it is at its closest point and that's what we'll be seeing on December 3". Since the moon's orbit is elliptical, one side (apogee) is about 30,000 miles (50,000 km) farther from Earth than the other (perigee). Due to this phenomenon from the ground you can see the larger size of the lunar disk than usual.
Unusual astronomical phenomenon called the Supermoon, or perigee moon.The orbit of the moon around the Earth in form is not a flawless circle, and a few stretches. Since the supermoon on Jan. 31 will be the second full moon in January, it's dubbed a Blue Moon, and will occur during a total lunar eclipse.
The last full moon of 2017 will appear especially plump and vibrant in the night sky on Sunday (Monday NZ time). This makes the moon to appear up to 14 percent larger and 30 percent brighter than usual. When a full moon is closer to our planet, the tide levels are often higher. Supermoons are set to occur twice in January, on the 2nd and 31st.
This means that each month the moon reaches a furthest point from earth and a closest point.
The first and last "Supermoon" of 2017 will be visible in the sky this weekend.
"We're seeing all of the Earth's sunrises and sunsets at that moment reflected from the surface of the Moon", says Sarah Noble, a Program Scientist at NASA headquarters.
A supermoon is also believed to have an impact on the Earth's waters.
For those using DSLR cameras, Ingalls recommends using another subject in the image, like a person, pet or landmark to compare to the size of the moon. "But it's another great chance to watch the Moon". "Supermoons aren't rare, but they're not an everyday occurrence either". Do it near the horizon, and do it again away from the horizon. "It's a fun way to get involved in science".