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This page is a mess.
Newer stuff towards bottom.  
A dot for every second in the day (includes a clock).
Some suggestions
How long 
age of visible universe 
10^{18} s 

year 
30 megaseconds 
3 × 10^{7}, 5%, ±<1%

hour

3600 s

exact

nanosecond (ns)

a lightfoot

[...]





Analysis
Age of visible universe
Year
10^{7} × 3.156  ±<<1%  [Vade, p9] 
10^{7} × pi
Ten Pi MegaSeconds  <1%, ±<1%  
10^{7} × 3
30 MegaSeconds  5%, ±<1%  
10^{5} × 365  +6%, ±<1%  ~10^{5} s/day * 365 day/year 
10^{7}  68%, ±<1%  
Ms (megasecond)
10^{6} × 1.00  exact  
10^{6} × 0.864 10 days  14%, ±1%  10 × (0.864 × 10^{5}) 
10^{6} × 0.950 11 days
10% up from 10 days  5%, ±<1%  
10^{6} × 0.990 11 days, 11 hrs  1%, ±<1%  275 hr 
10^{6} × 0.994 11.5 days  +<1%  276 hr 
10^{6} × 1.00 278 hours  ±<<1%  
10^{6} × 1.04 12 days  +4%, ±<1%  Landmark: "The Megasecond of Christmas" song... ? 
10^{6} × 1.08 300 hours  +8%, ±<1%  300 × 3600 
10^{6} × 1.21 two weeks  +20%, ±1%  2 × 7 × (0.864 × 10^{5}) 
Hour
10^{3} × 3.600  ±<1%  mumble (exact) and sidereal 
10^{3} × 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 
  

10^{2} 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 
  

10^{3} 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 
  

10^{4} 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 
  

10^{5} 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   
10^{0}  1 sec  10^{5} day 
10^{1}  10 sec  10^{4} day 
10^{2}  1.5 min  10^{3} day 
10^{3}  15. min  10^{2} day 
10^{4}   10^{1} day 
10^{5}   one day 
10^{6}   



15 min 
 hundredth day  (+4%, ±<1%) 
 900 s  (exact, which is 10% down from 10^{3} s) 
(A hundredthday is actually 14.4 min. A 15 minute hundredthday
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 hundredthday (25 hr), and a small kilosecond (900 s).
From 15 min: 10^{3} s ~= 15 min. 1.5 min. 150 min. Hours.
Megasecondday 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 megasecond of Christmas"...?
Ms is a large tenday, or a slightly shaved twelveday (dozenday?).
From Ms: 10^{4} 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 MegaSecondtenday
(twelveday).
15 min is a large hundredthday (25 hr day), and a small kilosecond (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 lightdelay page too.
History:
2001Apr14 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.