Formula

at = s / 31556930

Quick Rough Maths

To get the Tropical Years, divide the number of Seconds by 31.6 million

Seconds (s) in 1 Tropical Year

There are 31556930 Seconds in 1 Tropical Year

Tropical Years (at) in 1 Second

There are 0 Tropical Years in 1 Second

Symbol: **s**

Unit System: SI

Unit System: SI

The second is the SI base unit for time and has the symbol s.

The second is commonly understood to be 1/86400 of a day; there are 60 seconds in a minute, 60 minutes in an hour and 24 hours in a day.

Analog and digital watches and clocks almost all measure and display the progression of time via the use of a second counter / hand - and is generally considered the lowest denomination of time.

The earliest display and use of seconds was in the last half of the 16th century. Prior to this, it was not considered accurate enough to measure in seconds as a mechanical device was needed to ensure consistency.

In 1656, a Dutch scientist invented the first pendulum clock that measured seconds. His name was Christiaan Huygens.

Symbol: **at**

Unit System: SI

Unit System: SI

The tropical year is a unit of time that is a multiple of an SI unit. We have used the symbol at.

The average tropical year up to the year 2000 was 365.2422 days of 86400 seconds.

The phrase “tropical” comes from the Greek for “turn”; tropikos. Following this, and where the “turn” referred to is the same as that defining the tropics of Capricorn and Cancer (the extreme latitudes North and South where the sun can still appear directly overhead or perpendicular to the Earth’s surface); a tropical year is known as the time it takes the sun to complete a full cycle of seasons and return to the same relative position to the observer on Earth.

In 1627, Johannes Kepler used the findings of Tycho Brahe and Waltherus (the Rudolphine Tables) to establish the mean tropical year as 365 solar days, 5 hours, 48 minutes and 45 seconds.

10000s = 0at

20000s = 0at

30000s = 0at

40000s = 0at

50000s = 0at

60000s = 0at

70000s = 0at

80000s = 0at

90000s = 0at

100000s = 0at

110000s = 0at

120000s = 0at

130000s = 0at

140000s = 0at

150000s = 0at

160000s = 0.01at

170000s = 0.01at

180000s = 0.01at

190000s = 0.01at

200000s = 0.01at

210000s = 0.01at

220000s = 0.01at

230000s = 0.01at

240000s = 0.01at

260000s = 0.01at

270000s = 0.01at

280000s = 0.01at

290000s = 0.01at

300000s = 0.01at

310000s = 0.01at

320000s = 0.01at

330000s = 0.01at

340000s = 0.01at

350000s = 0.01at

360000s = 0.01at

370000s = 0.01at

380000s = 0.01at

390000s = 0.01at

400000s = 0.01at

410000s = 0.01at

420000s = 0.01at

430000s = 0.01at

440000s = 0.01at

450000s = 0.01at

460000s = 0.01at

470000s = 0.01at

480000s = 0.02at

490000s = 0.02at

510000s = 0.02at

520000s = 0.02at

530000s = 0.02at

540000s = 0.02at

550000s = 0.02at

560000s = 0.02at

570000s = 0.02at

580000s = 0.02at

590000s = 0.02at

600000s = 0.02at

610000s = 0.02at

620000s = 0.02at

630000s = 0.02at

640000s = 0.02at

650000s = 0.02at

660000s = 0.02at

670000s = 0.02at

680000s = 0.02at

690000s = 0.02at

700000s = 0.02at

710000s = 0.02at

720000s = 0.02at

730000s = 0.02at

740000s = 0.02at

760000s = 0.02at

770000s = 0.02at

780000s = 0.02at

790000s = 0.03at

800000s = 0.03at

810000s = 0.03at

820000s = 0.03at

830000s = 0.03at

840000s = 0.03at

850000s = 0.03at

860000s = 0.03at

870000s = 0.03at

880000s = 0.03at

890000s = 0.03at

900000s = 0.03at

910000s = 0.03at

920000s = 0.03at

930000s = 0.03at

940000s = 0.03at

950000s = 0.03at

960000s = 0.03at

970000s = 0.03at

980000s = 0.03at

990000s = 0.03at