What is Blood Moon, Blue Moon, Black Moon, Supermoon, and Full Wolf Moon? (Important) (Download PDF)


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Rare celestial event took place on 27th July when moon was visible to naked human eye in reddish colour. Scientists say this will be longest lunar eclipse of century & they have named this as ‘blood moon’.

Blood Moon, Blue Moon, Black Moon, Supermoon & Full Wolf Moon

Blood Moon, Blue Moon, Black Moon, Supermoon & Full Wolf Moon

Image of Blood Moon, Blue Moon, Black Moon, Supermoon, and Full Wolf Moon

Difference B/W All Moon Types

  • Black moon, blood moon, super moon, blue moon — In most cases, these names are given as per position or phase of moon & Gregorian calendar.

Blue Moon

  • ‘Blue Moon’ is said to have originated in 1940s & started being used only few decades ago.

  • This phenomenon has nothing to do w/its color. It looks same as any other full moon.

  • Blue moon is 2nd full moon to occur in month & sometimes, it is 3rd full moon in season.

  • On 31st January 2018, people were in for triple treat as blue moon, super moon & complete lunar eclipse, all rolled into one, mesmerized world.

  • Such lunar trifecta was rare phenomenon & had not happened in over 150 years.

  • This year’s 2nd blue moon was on 31st March. 2 blue moons in one year seem to contradict idiom ‘once in blue moon’ which indicates something rare.

  • Phenomenon last took place in 1999, on 31st January & 31st March. This won’t happen again until 31st January, 2037.

‘Once in Blue Moon’

  • In 2012 article in Sky & Telescope Magazine, Philip Hiscock says that this term is around for 400 years. Earliest use of this term was like saying moon is made of green cheese, which indicated something absurd.

  • Folklorist at Memorial University of Newfoundland, meaning evolved to ‘never’.

  • Even dust storms & forest fires can cause moon to turn blue. Meaning of ‘once in blue moon’ gradually changed from ‘never’ to ‘rarely’.

Black Moon

  • 2nd new moon in single month is called ‘black moon’. It is unusual celestial event, occurring about once every 32 months.
  • At its ‘new moon’ phase, moon is always black. New moon refers to moment when moon’s Earth-facing side is fully in shadow. Moon’s dark or illuminated side faces Earth during Black Moon.

Blood Moon

  • ‘Blood Moon’ happens during total lunar eclipse when earth passes in b/w sun & moon, which blocks sun’s light from falling directly onto moon.

  • Little light coming from edges of Earth’s atmosphere lit up moon’s surface making it appear red or reddish brown.

  • There is no need of special equipment to observe lunar eclipses. It can be viewed w/naked eye.

  • This year’s blood moon will take place on 27th July being termed as longest lunar eclipse to take place in century.

  • Eclipse will be visible in 2 parts, 1st of it being total lunar eclipse, followed by partial eclipse both of which will last for over hour.

  • Phenomenon might take up more than 4 hours to run its course, according to various reports.

  • ‘Blood Moon’ lunar eclipse to occur on 27th July will be longest one & is just 4 minutes short of being longest lunar eclipse to have ever been seen from Earth.

  • Stargazers in most countries won’t be able to view both eclipses one after other.

  • Due to geographical location of Indian sub-continent, both of these eclipses will be visible to naked eye.


  • ‘Supermoon’ occurs when moon is at or near closest point to earth. This point is called ‘perigee’. Perigee for January’s supermoon was said to be closest this year.

  • Supermoon makes moon appear 30 % brighter & about 14 % larger than typical full moons.

  • Supermoons do not occur every month, as there are chances that moon’s orbit changes direction as earth goes around sun. It means that full or new moon won’t always happen at its perigee.

Full Wolf Moon

  • It denotes 1st full moon in January. This dates back to early colonial times when wolves would howl outside villages.

  • Full Wolf Moon is also known as Old Moon, Moon after Yule & Snow Moon.

At What Time Will Be Eclipse Occur in India?

  • In India, eclipse will start around 5.18 pm. Super blue blood moon will be visible b/w 5.18 & 6.21 pm.

  • Total eclipse will end around 7.37 pm & Moon will slowly come out of shadow of Earth.

  • Partial eclipse will end around 8.41 pm. In total, eclipse will last for about 1 hour & 16 minutes.

  • It’s 1st total lunar eclipse since 2015

- Published/Last Modified on: September 14, 2018

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