Summer solstice to coincide with full moon for first time in 70 years

Posted: June 19, 2016 by oldbrew in moon, solar system dynamics
Tags: ,
Credit: NASA

Credit: NASA

Strictly speaking it’s been 68 years but we get the idea.
For links to videos see the original IB Times report

For the first time in 70 years, the full moon will rise on the day of the summer solstice. The rare astronomical event will occur on Monday (20 June 2016) and will be observed all around the world.

Solstices happen twice a year and correspond to the moment when the sun reaches its highest or lowest point from Earth as it orbits the Sun.

In the Northern Hemisphere, the June solstice marks the beginning of summer and is the longest day of the year, because it has the longest period of daylight. [Well, yes.]

Watch it as it happens

The full moon can generally be seen as a month comes to end, and mathematical models predict that it can only exactly fall on the day of a solstice every 15 years.

In reality, a full solstice moon in June has not been observed for a lot longer – since 1948, in fact.

Slooh’s astronomers will broadcast the event live from their community observatory in the Canaries and the result can be watched [see link below for details] on 20 June at 01:00 UK time.

Alternatively, viewers can also go to to watch the broadcast, snap and share photos, chat with other audience members, interact with the hosts and personally control Slooh’s telescopes.

During the event, astronomers will discuss the significance of the two events – the solstice and the full moon – happening at the same time. They will explore the importance of the solstice as a seasonal celebration in cultures across the world and throughout history.

Full report: Summer solstice to coincide with full moon for first time in 70 years: Watch live online | IB Times

Vox: The summer solstice is Monday: A short guide to the longest day of the year

  1. Chaeremon says:

    @oldbrew Re: The full moon can generally be seen as a month comes to end, and mathematical models predict that it can only exactly fall on the day of a solstice every 15 years.

    After 15 years (5478 days + x hours) the moon is on the other side of the ecliptic (180°) and therefore in the other half of the synodic month (full <-> new moon).

  2. oldbrew says:

    So when they say ‘on the day of a solstice every 15 years’ that could be summer or winter solstice.

  3. oldbrew says:

    Looks like 2111 full moon cycles every 2380 tropical years (68 x 35).
    That would be 269 lunar apsidal cycles (2380 – 2111).

    Note: last FMC with a summer solstice was 68 years ago.

  4. Chaeremon says:

    @oldbrew Re: last [full-moon] with a summer solstice was 68 years ago.

    This means, 68 years is even and between them 841 synodic is odd, therefore in the middle (1982/06/21) was summer solstice with new moon 😉

  5. p.g.sharrow says:

    Reblogged this on pgtruspace's blog and commented:
    Once again the Terra – Luna pair have circled the Solar dance floor, the northern hemisphere is now exposed to the solar furnace and the southern one the cold of deep space. Enjoy! soon enough that orientation will reverse and it will be our turn to shiver.
    For the the time being I am enjoying the spell of growing green life all around me and the promise of the sun warmed bounty from the fruitful earth. Consumed the first tasty morsels today, A few Giant Blackberries, a hint of the Summer harvest to come 8-).
    Thanks be to the GOD that makes this miracle of sun, water and carbon…pg

  6. Richard111 says:

    Humph! 10/10ths cloud and pouring with rain here in Pembrokeshire. Wonder if we will see the sun today, never mind the moon.

  7. oldbrew says:

    HuffPo says it last occurred on the same day in 1967. But:
    ‘The last time the solstice and the Strawberry Moon occurred at almost the same time was in 1948.’

  8. oldmanK says:

    In my locality the solstice is on June 21st. very very early.

    Qoute: “The date varies between June 20 and June 22, depending on the year, and which time zone you are in.

    June Solstice in Valletta, Malta is on
    Tuesday, 21 June 2016, 00:34 CEST (Change city)

    June Solstice in Universal Coordinated Time is on
    Monday, 20 June 2016, 22:34 UTC “.

    My very ancient calendar says it will be 3 hours later. Doesn’t matter it is still sleep time.

  9. oldbrew says:

    The so-called Egyptian Stonehenge at Nabta Playa “calendar circle” ‘indicates the approximate direction of summer solstice sunrise’. – Wikipedia

    An inventory of Egyptian archaeoastronomical sites for the UNESCO World Heritage Convention evaluated Nabta Playa as having “hypothetical solar and stellar alignments.”

    Here’s the ‘Earliest’ Sign that Humans Knew About the Summer Solstice

    [recreated from the original]