full moon

3 Comments Posted on by Reji Koduvath Canada

Celestial Spectacles: Understanding Supermoons and the Beaver Moon of 2025

The full moon of November 5, 2025, will be a notable celestial event: the second supermoon of the year, adorned with the traditional name Beaver Moon. This occurrence provides a perfect opportunity to explore the fascinating interplay of lunar nicknames, orbital mechanics, and the science behind these brilliant apparitions.

The Cultural Tapestry of Full Moon Names

Each month’s full moon carries a name rooted in cultural and natural history, often originating from Native American, Colonial American, and European traditions. The November full moon is known as the Beaver Moon. According to the Old Farmer’s Almanac, this name signifies the time when beavers begin to retreat to their lodges for the winter. An alternative explanation points to the historical fur trade, as this was the season to set beaver traps before the swamps froze.

These names create a yearly almanac in the sky, connecting the heavens to the rhythms of life on Earth. Below is a list of the commonly accepted full moon names:

MonthFull Moon Name
JanuaryWolf Moon
FebruarySnow Moon
MarchWorm Moon
AprilPink Moon
MayFlower Moon
JuneStrawberry Moon
JulyBuck Moon
AugustSturgeon Moon
SeptemberCorn Moon (or Harvest Moon)
OctoberHunter’s Moon (or Harvest Moon)
NovemberBeaver Moon
DecemberCold Moon

The Science of Supermoons

To understand a supermoon, one must first examine the Moon’s orbit. The Moon does not circle Earth in a perfect circle but in an elliptical orbit, which is inclined about 5 degrees to Earth’s orbital plane. This path has two key points:

  • Perigee: The point where the Moon is closest to Earth.
  • Apogee: The point where it is farthest.

A supermoon occurs when a full moon coincides with or is near the Moon’s perigee. At this moment, the Moon can appear up to 7% larger and 16% brighter than an average full moon. Conversely, a micromoon is a full moon near apogee, appearing noticeably smaller and dimmer.

The term supermoon was popularised by astrologer Richard Nolle in 1979 and gained widespread use in the media during a particularly close approach in March 2011.

The Lunar Cycle: Phases and the Blue Moon

The Moon’s phases are governed by two distinct cycles:

  1. Sidereal Month (27.55 days): The time it takes the Moon to complete one orbit around Earth and return to the same position relative to the stars.
  2. Lunar Month (29.53 days): Also called the synodic month, this is the time from one new moon to the next, which is longer due to Earth’s simultaneous revolution around the Sun.

This discrepancy between the lunar month and our calendar months (30 or 31 days) gives rise to the Blue Moon. The idiom once in a blue moon describes a rare event, but astronomically, a seasonal Blue Moon (the third full moon in a season with four) or a monthly Blue Moon (the second full moon in a single calendar month) occurs roughly every 2.7 years. Because February is shorter than a lunar month, it can never host a Blue Moon.

On rare occasions, a double Blue Moon can occur within a single year, a phenomenon that happens only 3 to 5 times per century. The last was in 1999, and the next will be in 2037.

A Celestial Convergence

The supermoon of November 14, 2016, was a record-setter, being the closest full moon since 1948—a record that will not be surpassed until November 25, 2034. The Beaver Moon on November 5, 2025, continues this cycle of celestial wonder, offering a brilliant reminder of the dynamic and predictable dance of our closest celestial neighbour. It is a chance to witness a beautiful fusion of ancient tradition and modern astronomy.

Indian Astronomy and Full Moons

While the term Supermoon is a modern astronomical concept without a direct equivalent in Indian astronomy, the tradition of naming full moons is deeply rooted in Indian culture. The Sanskrit word for full moon, Purnima, serves as the foundation for a calendar of lunar observations tied to seasons and festivals. These are not merely astronomical markers but are imbued with cultural and religious significance. For instance, Chaitra Purnima (March/April) often heralds the Hindu New Year, while Ashadha Purnima (June/July) is revered as Guru Purnima, a day to honour teachers. The harvest moon of Sharad Purnima (September/October) is dedicated to the goddess Lakshmi, and Kartik Purnima (October/November) celebrates the birth of the deity Kartikeya. Thus, each full moon connects the celestial cycle to the rhythm of life and spirituality in India.

6 Comments Posted on by Reji Koduvath Canada

Super Blue Blood Moon


On 31 January 2018, it was a Super Blue Blood Moon – crossover of three individual lunar occurrences happening at the same exact time.  It was a lunar spectacle, a stellar show in the sky that night.  Last super blue blood Moon happened way back on March 31, 1866.

Social media was abuzz with all possible details and explanations and also many e-rumours, some grotesque and some funny.  Many conspiracy theorists claimed that this spectacular lunar display as a sign that end of the world is coming near.

To study this phenomenon, one needs to look at the moon’s orbit.  It is elliptical shaped, inclined at about 5 degrees.  It is offset from the centre with the closest point from the earth called ‘Perigee’ and the farthest ‘Apogee’.  The moon revolves around the earth along this orbit in 27.55 days.  As the moon revolves, it also rotates along its axis in very same 27.55 days.  Thus we see the same face of the moon every time.

New moon waxes to a full moon and then wanes back to new moon.  This takes 29.53 days and is called a lunar month.  It is due to revolution of the moon around the earth and the earth’s revolution around the sun.


A super-moon is when a full moon occurs when the moon is at its Perigee.  The New Year Day of 2018 was ushered in by a super-moon.  A super-moon appears around 7% bigger than an average full moon  and 12% to 14% bigger than a micro-moon – when a full moon occurs around Apogee.  Super-moon appears the biggest of all full moons as it is the closest it can get to earth.

Next super-moon will appear after 15 revolutions by the moon around the earth (15×27.55) – about 413 days  as it would coincide with a full moon after 14 lunar months (14×29.53) – about 413 days (one year and 48 days).  Thus we can calculate past and future super-moons.

The term  super-moon is believed to have been coined  by astrologer Richard Nolle in 1979 in Dell Horoscope magazine .  It gained credence when the media titled the full moon of March 19, 2011 as super-moon.

The idiom ‘once in a blue-moon‘ refers to a rare occurrence, but in fact it appears once every 2.7 years, because the lunar month – from new moon to new moon-  is 29.53 days compared to 30 or 31 days of our calendar month.  Hence February (with 28 or 29 days) can never witness a blue-moon.

12 lunar months  (12×29.53) makes it 354.36 days, against the 365.25 days in a calendar year,  The difference of (365.25-354.36) 10.89 days adds up over 2.7 years (2 years 8 months) to about 29.5  days, which is a lunar month.  Last blue-moon occurred on July 31, 2015.

2018 had another specialty. January has a blue-moon on 31st.  As February of 2018 year had only 28 days, there was no full moon in February.  This resulted in March having two full moons on the 2nd and 31st being a blue-moon again. Double blue-moons occur about 3 to 5 times in a century. The next occurrence will be 2037, while the last was in 1999.

Super-blue-moon on January 31 coincided with a total lunar eclipse, which is colloquially referred to as  a  blood-moon or a red-moon.  The Moon turned a shade of red as observed from many parts of the world as the earth moves between the sun and the moon, casting its shadow on the moon’s surface.  The moon takes 3 hours and 23 minutes to cross the earth’s shadow.

Even though the moon was in the umbral region of eclipse, some of the red spectrum of visible light  emanating from the sun (longest wavelength) tended to skim over the earth and reach the moon. This red spectrum was reflected by the moon when it was passing through the umbral region.  Thus the moon appeared red with a copper-tone during the eclipse.


Lunar eclipse, partial or total, can only occur on a full moon day as that is the only time, the earth may come in line between the sun and the moon, casting its shadow on the moon.  Eclipse does not happen every full moon as the earth’s orbit around the sun is not in the same plane as the moon’s orbit around the earth.


(Image Courtesy NASA)

Eastern North America saw beginning stages of the partial umbral eclipse low in the west before sunrise of January 31.  Portions of the Middle East and far-eastern Europe viewed the ending stages of the partial umbral eclipse low in the east after sunset.  Indian subcontinent, the Middle East and Eastern Europe, the eclipse was already underway as the moon rose.  In India it commenced at 6:21 PM on January 31 2018 and was visible till 7:37 PM.  South America, most of Europe and Africa did not witness this trilogy.