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Analysis

Age of visible universe

Year

107 × 3.156	±<<1%	[Vade, p9]
107 × pi Ten Pi MegaSeconds	-<1%, ±<1%
107 × 3 30 MegaSeconds	-5%, ±<1%
105 × 365	+6%, ±<1%	~105 s/day * 365 day/year
107	-68%, ±<1%

Ms (megasecond)

106 × 1.00	exact
106 × 0.864 10 days	-14%, ±1%	10 × (0.864 × 105)
106 × 0.950 11 days 10% up from 10 days	-5%, ±<1%
106 × 0.990 11 days, 11 hrs	-1%, ±<1%	275 hr
106 × 0.994 11.5 days	+<1%	276 hr
106 × 1.00 278 hours	±<<1%
106 × 1.04 12 days	+4%, ±<1%	Landmark: "The Megasecond of Christmas" song... ?
106 × 1.08 300 hours	+8%, ±<1%	300 × 3600
106 × 1.21 two weeks	+20%, ±1%	2 × 7 × (0.864 × 105)

Hour

103 × 3.600	±<1%	mumble (exact) and sidereal
103 × 3 three ee three	+16%, ±1%

What is...

1 s -- 1/60 min (exact) 10-5 day (-14%, ±<1%) 1 s exact 1/60 min exact 10-5 day -14%, ±<1% 0.864 2% of a minute +20%, exact 1.2 s 10-2 min one hundredth minute -40%, exact 0.6 s	10 s -- 1/6 min (exact) 10-4 day (-14%, ±<1%) 10 s exact 1/6 min exact 10-4 day -14%, ±<1% 0.864
102 s -- 1.5 minutes (-10%, exact) thousandth day (-14%, ±<1%) 1 2/3 minutes (exact) 100 s exact 1 2/3 min exact 3% of an hour +8%, exact 108 s 1.5 min 1/40 hr -10%, exact 90 s 10-3 day -14%, ±<1% 86.4 s 2 min +20%, exact 120 s 1 min -40%, exact 60 s 10-4 week -40%, ±<1% 60.48 s	103 s -- 15 min (-10%, exact) hundredth day (-14%, ±<1%) 1000 s exact 17 min +2%, exact 1020 s 16 min -4%, ±<1% 0960 s 15 min 1/4 hr -10%, exact 900 s 10-2 day hundredth day -14%, ±<1% 864 s 20 min 1/3 hr +20%, exact 1200 s
104 s -- 3 hr (+8%, exact) tenth day (-14%, ±<1%) 2 3/4 hr (-1%, ±<1%) 10 000 s exact 2 3/4 hr -1%, ±<1% 09 900 s 3 hr +8%, exact 10 800 s 150 min -10%, ±<1% 09 000 s 10-1 day a tenth day -14%, ±<1% 08 640 s	105 s -- one day (-14%, ±<1%) 28 hr (<1%, ±<1%) 100 000 s exact 28 hr <1%, ±<1% 100 800 s 1666 min <1%, ±<1% 099 960 s 30 hr +8%, exact 108 000 s 1500 min -10%, exact 090 000 s 1 day -14%, ±<1% 086 400 s

s 100 1 sec 10-5 day 101 10 sec 10-4 day 102 1.5 min 10-3 day 103 15. min 10-2 day 104 10-1 day 105 one day 106

15 min	-- hundredth day	(+4%, ±<1%)
	-- 900 s	(exact, which is -10% down from 103 s)

(A hundredth-day is actually 14.4 min. A 15 minute hundredth-day gives a 25 hour day (exact).
The +4% error is thus 1/24. 100 vs 100+ the 4 15min's in the extra hour.)
15 min links nicely with day, seconds, and minutes.
15 min is a large hundredth-day (25 hr), and a small kilo-second (900 s).
From 15 min: 10³ s ~= 15 min. 1.5 min. 150 min. Hours.
Megasecond-day error derivation (14% from 10% down plus 4% up)

MegaSecond = 12 days. But year = 365 days is 12 * 30 (months!). So 30 Ms.

"The One MegaSecond of Christmas" song:
MegaSecond is 12 days (closer, 11 days + 14 hours). So...
"On the first day of Christmas, my true love gave to me...
On the twelfth day of Christmas, Err, On the first MegaSecond of Christmas, my true love gave to me, twelve swans a' swimming, ..."
Hmm... "on the first twelfth mega-second of Christmas"...?

Ms is a large ten-day, or a slightly shaved twelve-day (dozen-day?).
From Ms: 10⁴ is tenth day. 10, 100, 1000... days. Week, month, year, century.

If a year is 30 MegaSeconds, then a thousand years is 30 GigaSeconds, a MY is 30 TeraSeconds, a billion_us years is 30 PetaSeconds, and the universe, at something like 15 BY, is something more than 300 PetaSeconds, and around 0.4 ExaSeconds.

A nice framework can be hung on `15 minutes' and MegaSecond-tenday (-twelveday).
15 min is a large hundredth-day (25 hr day), and a small kilo-second (900 s).
So a MegaSecond is about 10 days. Better, 12 days, as in "The One MegaSecond of Christmas" song.
12 * 30 is 365 (as in months), so a year is about 30 MegaSeconds.
Or slightly closer at 10 pi MegaSeconds, if you care.
A decade is thus 300 MegaSeconds, and a century 3 GigaSeconds.
If a year is 30 MegaSeconds, then a thousand years is 30 GigaSeconds,
a MY is 30 TeraSeconds, a billion_us years is 30 PetaSeconds,
and the universe, at something more than 10 BY, is something more than 300 PetaSeconds,
and around half an ExaSecond.

Doables:
  Gosh this page is a mess.
  Extend "What is 10^x s", folding in Ms.
  Day is 100 * 10^3 s + 10^3 s (- ~5 min).  [Huh?]
  Comment on how well `age of universe' works.  On light-delay page too.

History:
  2001-Apr-14  Added link to `A dot for every second in the day'.
  1998.Jul.20  Fiddled.  Added 15 min, "MegaSecond of Christmas" song.
  1998.Apr.19  Added "what is 10^{0,1,2,3,4} s" landmarks.
  Long ago     Created.