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year (tropical) 
Symbol:  atrop. 
Category:  Time 
SI Equivalent:  3.15569×107 s
Dimension:  T 
Notes
The time interval corresponds to one revolution of the earth about the sun measured between successive mean vernal equinoxes.
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Convert     atrop.  
1 atrop. = 
Permeability coefficient
  Symbol Unit Name
3.15569×107  kg-m/N-s  kilogram meter per newton per second 
2.17152×1019  perm-inch (0 °C)  perm-inch (0°C) 
2.16249×1019  perm-inch (23 °C)  perm-inch (23°C) 
2.17152×1022  perm-mil (0 °C)  perm-mil (0°C) 
2.16249×1022  perm-mil (23 °C)  perm-mil (23°C) 
Time
  Symbol Unit Name
1.30461×1024  a.u.  a.u. of time 
3.65242×107    blink 
365.242  d  day 
366.243  d (sider.)  day (sidereal) 
26.0887    fortnight 
8765.81  h  hour 
3.35726×1030    Jordan's elementary time 
3.15569×1013  ms  microsecond 
3.15569×1010  ms  millisecond 
5.25949×105  min, mn  minute 
12.1747    month (30 days) 
13.3682    month (sidereal) 
12.008    month (solar mean) 
12.3683    month (synodic), lunar month 
3.15569×1016  ns  nanosecond 
3.15569×107  s  second 
3.15569×1015    shake 
52.1775  w  week 
9.46708×1016    wink 
0.99997  aastr.  year (astronomical), Bessel year 
1.00066  a, y  year (calendar) 
0.999961    year (sidereal) 
0.999979  a, y  year (solar mean) 
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