← Back to Episodes

Daily 124: Millions Monday - Moon Math

ai-in-the-air_day-124
Download MP3

Summary

Short week (spring break Friday off). Parent tested positive - some families staying home, only 20 people. New student enrolled. Nail Corporation and VR Corporation meetings. Phil digging tetherpole base. Millions Monday: moon rises 48 minutes later each day (24 hours ÷ 30 days × 60 min). Full moon probability on birthday: 1-(29/30)^n. Blue moon every ~3 years. Personal story of full moons during courtship/marriage year.

Transcript

0:00 Welcome to Arts and Ideas in the Air, under the sky, by the fire, and around
0:04 Baltimore, your daily podcast briefing of all the goings ons, ins, and rounds of Arts
0:08 and Ideas Sudbury School. So today was Monday, first day of the week, it's a
0:13 short week, four-day week, and we'll have Friday off. This is our spring break week,
0:20 which school meeting canceled, but a number of people had plans, so we are
0:26 out of less attendance for that. And we also had a parent test positive for
0:33 COVID, and so some people in that kind of group are also staying home, and so we
0:42 only had like 20 people here today. It was a very quiet day, it was a very
0:46 beautiful day, absolutely great weather, perfect spring day. We had our Monday
0:53 announcements, where it was announced about meetings for Nail Corporation,
0:58 where it's all about making beautiful nails, and Virtual Reality Corporation
1:03 revealing their Oculus Rift. And yeah, I made some announcements for hopefully
1:12 looking for school meeting clerk, or JC clerk, or staff relations clerk to take
1:18 feedback from students. This is a hard year to get students to really step up. I
1:23 get it, but I really wish I could find some people who do that. But with only 20
1:31 people here, there isn't even that much going on. But anyway, so yeah, I think
1:39 people were hanging out today, some activity. Phil dug up the old concrete
1:45 of the tetherpole base, because I separated it from the dirt, and he's
1:52 gonna try to re-concrete plant it sometime this week. That's fun. Right now
1:58 we have a green dude, our green safety dude, tied up to the base of an
2:04 umbrella with caution tape, and a big sign saying do not move. So hopefully no
2:09 one will trip over that hole. I think that's kind of the big thing. So we did
2:18 have one student who came in from being online to being in person, and a new
2:23 student actually joined our school. So that was exciting. Yeah, we keep, we do
2:31 keep adding people, even though there's some people here temporarily. But
2:35 hopefully in a week or two we'll be, you know, back on the progress. COVID numbers
2:44 around here are still going up. I'm not sure why, but hopefully that'll stop soon.
2:50 I don't know. I guess we'll have to see what's going on. But just a reminder
2:57 that assembly decided to no longer have an automatic shutdown of in-person
3:03 based on the numbers. We're still monitoring them, and assembly can always
3:08 revisit that if need be. But assembly decided that families can make their own
3:13 decisions, and staff being fully vaccinated, their risk has been greatly
3:18 reduced. So that's good. All right, it's Millions Monday, and the moon is up, so I
3:25 was going to talk about that. So a lot of people seem to think that the moon is
3:29 only up at night, obviously, because that's the time when its presence makes
3:33 itself felt. But, you know, the moon travels throughout its period at
3:39 different times of the day. Specifically, it gets later each day. Now, how much
3:45 later? Well, glad you asked. So after, so the period of a moon is about 30 days.
3:53 That's what a month is. Not, not accidentally there. It's, you know, I can
4:02 well imagine that when you have nothing else to go by, a moon going through its
4:07 different phases is a pretty darn good calendar marker. You know, right now I'm
4:14 looking at it, and it's, you know, it rises during the day and sets at night, and
4:21 that tells me one part of the phase, and I can see that it's about half, and, you
4:25 know, so I can actually mark the different days. So one period of a moon
4:29 being a month makes a lot of sense from that perspective, if I had a need to
4:35 track time like that. So, given that it is 30 days, how much later does the moon
4:41 rise, or does it rise earlier? Well, so, basically, what you have is, you've got
4:55 30 days, and, you know, you've got a 24-hour period, and then so after, you
5:05 know, this is an assumption that basically after the full period it's
5:13 gonna rise at the same time. I mean, it does that, but the period isn't exactly 30
5:19 days, but whatever. We're just gonna go with that because that makes it easier.
5:23 It's about 30 days. So that means you've got to fit a 24-hour period of risings
5:32 into 30 days. So basically means I want to divide the 24 hours by 30. Okay, now
5:45 24 over 30, that's a fraction. I could reduce it, but let's not do that right
5:50 now. Instead think, well, it's going to be in minutes because it's going to be 30 is
5:53 bigger than 24, so it's a fraction of an hour, so why don't we talk in minutes?
5:57 All right, now how do I convert from hours to minutes? Well, 60 minutes in an
6:01 hour, so I have 60 minutes for each hour, so I'm going to multiply 24 and 60, right?
6:08 Now I'm not going to do that multiplication. That sounds a little bit
6:12 on the complicated side. I've got 24 times 60, I'm dividing by 30, and now I've
6:16 gotten something easy. 60 over 30 is just 2 because 30 plus 30 is 60, right? So 24
6:24 times 2 is 48. This is going to be in minutes, so 48 minutes. Approximately
6:28 every 48 minutes. I mean, every day the moon is rising 48 minutes later, more or
6:34 less. And, you know, by going through that you can figure out what it actually
6:39 should be. Now, when I was younger, about 30, maybe 32, I think it was 32, I had a
6:54 bet with someone, and I said, "Ah, I bet there's been a full moon on my
6:59 birthday at some point in my life." I was very big into the moon, and, well, that
7:04 person took the bet, and uncharacteristically I actually lost
7:08 that bet. However, I kind of won a bigger bet because that very year I had a full
7:14 moon on my birthday. I didn't know that it was coming up, but it was, and
7:18 because I made that bet I found out that it was, and that was a very special year,
7:23 because that's the year I got married to my wife, and the full moon was present.
7:29 I was there for a kind of, not actual first date, but kind of date event, and then
7:37 there was our actual first date, and then our engagement, and then our marriage, all
7:45 one full moon right after another. So that was pretty awesome. It's glorious.
7:53 And then that year was my wife's birthday, had a full moon on her birthday,
8:00 and on my birthday, and our, we had a second wedding, so we kind of had a
8:06 private wedding first, and then we had a big public wedding, and that was also on
8:11 a full moon. Full moons everywhere. That's great. I even traveled to Hawaii just to
8:20 be able to see the full moon on my birthday, and that didn't go so well,
8:24 because apparently it likes to be cloudy in Hawaii at night. Oh well. Anyway, so what
8:34 is the probability of having a full moon on your birthday? What is that? Well,
8:42 basically, I mean, this is the reason why I took that bet. You can think of, you
8:49 know, it's not random what day the full moon is on. I mean, you can compute it out
8:53 for millennia, but it's, you can roughly think of it as kind of this random event.
8:59 I mean, you can think of my birth as a random event, if you will, and so you can
9:06 just say, well, you've got a 1 in 30 chance of it being on my birthday of any,
9:12 you know, given year, and so, you know, the probability of it kind of, so you kind
9:28 of, um, yeah, so the probability of it being on my birthday in a given year is
9:43 1 in 30. So then the probability of my not having, of having a full moon at some
9:54 point on my birthday is 1 minus the probability of my not having a full moon
10:02 on any of my birthdays, and so it's, you know, for each year it's 29 over 30
10:11 probability of not having a full moon on my birthday, and so we multiply those
10:17 together repeatedly, and then you do 1 minus that, and then you get a
10:22 probability, and, well, I'll just say that I was unlucky that with that bit.
10:33 Nevertheless, there you go, another little fun fact is a blue moon is something
10:39 that's a full moon that happens twice in a month, so basically that's, uh, happens
10:46 on the first and the 31st of the month. That's what happens, and so when we, you
10:58 know, how often does that happen? Well, um, again, it's sort of like this 30 days
11:05 kind of thing, roughly, um, so, you know, like it needs to be on the first of a
11:12 month for 31 days, and so more or less 30 some months to go, so it's roughly like
11:22 every three years, give or take a few months. So that's, uh, that's the story of
11:30 the blue moon, and, I don't know, I guess that's just some of my musings on the moon
11:42 stuff, but basically my main message is, hey, the moon is up in the sky right now,
11:48 right today, at this very moment, take a look, it's beautiful, it's beautiful, it's
11:53 a beautiful blue sky, a little white half shape up there, it'll be a full moon
11:59 in a week, that's what that's kind of telling us, and, I don't know, I think the
12:05 moon, the moon, the moon, the moon is just this beautiful, beautiful, um, object to
12:13 stare at, that's, it's a really great gift that we all can just, like, look at this
12:18 moon, it's a beautiful, wonderful moon. Alright, I've levered on enough, thanks
12:23 for listening, and I will see you when I see you.
12:29 [BLANK_AUDIO]