Full Moon – Friday the 13th

June 13th, 2014 at 4:20 am by under Bill's Blog, News, Weather

moon full NASA bill ingalls   I hope this doesn’t get too confusing…but, here goes….We have both a full moon and today is Friday the 13th. Well, we do, but Milwaukee doesn’t.   That’s because the exact time of the full moon was 12:11 am EDT.  So…the full moon plus Friday the 13th thing works for the Eastern Time Zone (and Asia, Europe, S. America and Africa), but not for the Central, Mountain and Western Time Zones in the U.S., where the full moon came the evening of 6/12.   Since there are 7 days in a week, there is a 1 in 7 chance that the 13th of the month will come on a Friday (or 14.29%).  A given year can have anywhere from 1 to 3 Friday the 13ths.  There’s a full moon on the 13th of the month about every 3 years.  The time between full moons is 29 days, 12 hours and 44 minutes.   So, we can get 2 full moons in a given month (the 2nd full moon in a calendar month is called a “blue moon”), and on rare occasion, February can have no full moon at all.   That last happened in 1999 and will happen next in 2018.   On average, there are 12.37 full moons in a year and 365.2422 days in a year (and that’s a whole new set of fun math problems…because that’s an odd number, we add a leap day every 4th year…that would work if it was exactly 365.25 days in a year…but because of that .2422, we skip leap year if we can divide 100 into the year…so we didn’t have leap year in 1800 or 1900 – but…we DO have leap year if you can divide 400 into the year, so we DID have leap year in 2000).  Now, there are 12 days a year that are the 13th.  That would be 3.29% of the days of the year.   The odds of any one day being a full moon are 3.39 percent.  So you multiply those numbers and…The odds of any single day being a Friday, the 13th and a full moon are about .0159%.   Since there are 365.25 days in a year, you multiply those two numbers and you get a 5.81% chance that any year will have a single day that is a Friday the 13th and have a full moon – or about once every 20 years.   The last Friday the 13th with a full moon was Oct. 13th, 2000 and the next Friday the 13th with a full moon will be Aug. 13, 2049.  The last June 13th with a full moon was in 1919 (my almost 95-year old mother missed that one by less than a month).  The next full moon on Friday, June 13th will be in the year 2098.  This is the full moon closest to the Summer Solstice (June 21 this year), so it’s the full moon that is lowest in the sky, rising in the SE and setting in the SW.  The June full moon is sometimes called the “Honey Moon” because being lower in the sky and coming during the often hazy summer season, it often has a yellowish or honey hue.  The full moon of June is also called the Strawberry Moon.  The picture is the June “Honey Moon” over the Washington Monument (From Bill Ingalls and NASA).   Many couples get married in June – and the term “honeymoon” goes back to the 1500s.   It’s been fun to write this article…all the while one of my two cats has been chasing a fly – I’ve been enjoying her leaps and bounds – her compensating for her inability to fly.  I’ve seen her leap and swat down flies in mid-air (and eat them…she won’t eat mice, just plays with them…but insects, that’s kitty chow).  She has wonderful vision (and I think other senses as well) compared to me.  So far, the fly has stayed a step ahead of her.

22 Responses to “Full Moon – Friday the 13th”

  1. Dan (Byron Center) says:

    The strawberry moon looks awesome! So bright and shining this am! A little cool but it’s going to be very nice. Tigers get a win as Mad Max goes the distance for a shut out!

  2. Barry in Zeeland says:

    Wow, I love numbers, but it’s a bit early. I’ll have to re-read all that this afternoon.

  3. Mark (East Lansing) says:

    Not bad this morning but low to mid 40s tonight? It’s bonfire time.

    1. DF (SE Mich) says:

      Sounds like the night! Some record lows may fall tonight, it will be close.

  4. DarrenSVRstm ( Cedar S ) says:

    Very nice write -up Bill , down to your cats practicing take – offs and landings. The moon looked very cool last night with the clouds passing bye and it being Friday the 13th as well , and now I know how rare the two are together. :)

  5. fixxxer says:

    Nice october day… :/

  6. INDY says:

    Ohhhh Bill the rodys and fixers will be out strong tonight on sugar with a full moon mannn look out!! Your blog may blow up!! weather news will we even hit 70* today this is another below normal day in West Michigan chalk it up!! Put another log on the fire and keep drinking sprites on this Friday 13th crazzzzy night!! Your Friend INDYY!!

  7. SlimJim NW GR (1) says:

    The clouds have now moved in and there is a cool breeze so with the windows open I had to grab a long sleeve shirt to pup on (heck I might have to close the windows) the temp here is 56° and in the UP some of the temps there are only in the 40’s and if Joe B is it be believed after this warm up we could be looking at more very cool weather. And while its getting smaller the snow patch is still there on Mt Ripley. Just think it’s June 13th and there is still a patch of snow here in Michigan!
    http://www.mtu.edu/webcams/ripley/
    My wife and I are going up to Bay City this weekend. So have a nice weekend everone
    SlimJim

    1. Rad (Jenison/Hudsonville) says:

      Im starting to wonder if that patch of snow is real or not ?

    2. Kristine says:

      Hard to tell if it’s snow or not (still). The hill faces south, and snow was getting sparse several weeks ago up there on Memorial Day weekend. Only to be found in shaded spots in the woods, not wide open sunny hills like Ripley. But if you look at time lapse, the spot has shrunk since June 1st.

      I’m definitely looking at it when we drive by this summer!

  8. Sandi says:

    Brrrr back to sweatshirt weather! Glad it’s only temporary.

  9. Since the posting of this write-up..I am left wondering what has happened to the fly…Lol

    1. Bill Steffen says:

      I haven’t seen the fly and the cat has spent a lot of time in the basement…which might mean that she smells a mouse.

  10. kevin. w says:

    So while were talking about the moons and Friday the 13th, how about we talk about the big severe weather and tornado outbreaks coming next week. Cold pool aloft coming down from Alaska giving quite the spin in the atmosphere to produce maybe the largest severe weather outbreak coming across the upper plains, midwest and eventually the east. Wouldn’t be surprised this could be the biggest severe event this year, but no talks from anyone as of yet. But hey the moon has cratters and everyone shakin’ on the 13th.

    1. DarrenSVRstm ( Cedar S ) says:

      Can you be more specific , next week..? If so when..? Tomorrow will be an active day for Nebraska but I’m not sure to when next week you are referring Kevin as I’m not seeing anything of the ” biggest outbreak ” of the season at least through Tuesday but I haven’t really looked past that point. So plz share ..

    2. Rocky (Rockford) says:

      The almighty kevin has spoken. Everyone bow down to his opinion!!

  11. Mark (East Lansing) says:

    Got the day off. Just got back from playing tennis with my kids. It is chilly out. That wind is brisk.

  12. Steve B says:

    Even more astounding than the odds that a full moon will occur on Friday the 13th, are the odds that someone will actually calculate those odds. Current world population of 7,240,000,000 into 1 Bill Steffen equals .00000000013812% !

  13. Jack says:

    In Other ” Words”, This Only Happens Once in a BLUE MOON !!! Aye Bill…. ;-) . Just Came inside after Standing In AWE, of The AWESOME FULL MOON RISING !! Thank You LORD……. !!!! Stay CUEDDD, and Keep Looking UP!!!! ;-)

  14. Jan A. says:

    Just called my uncle George who turned 95 on June 3, 2014. He was born in 1919 and was 10 days old the last time this happened in the month of June. Wow….he is planning to peek out the back door as we speak!!

  15. Bernie (At da Lakeshore) says:

    I picked a quart of ripe strawberries from my little strawberry patch today. They are a lot sweeter than the ones imported from Florida and California. :)
    I am going to keep calling the June Moon the Strawberry Moon. Honey doesn’t get harvested until September.

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