If you are seeing this in a mobile device use it in horizontal position

What time is it?

Answering the very simple question "what time is it?" is not as simple as it seems. In astronomy, time is a complex quantity, measured with different scales and units and using as reference different moments in history. In this app, we want to illustrate the complexity of the measuremente of time in astronomy by showing the multiple answers you can get to the question "what time is it?".

Looking for longitud...
Geographical longitude:

LMT
--:--:--.---
Local mean time, time shown by clocks in the time zone.
MST
--:--:--.---
Mean solar time, mean solar time at the exact location.
TST
--:--:--.---
True Solar Time, hora solar verdadera en el lugar exacto en el que se encuentra.
UTC
--:--:--.---
Universal Coordinated Time, local mean time in Greenwich.
UT1
--:--:--.---
Universal Time, mean time in Greenwich adjusted to the Earth's rotation.
TAI
--:--:--.---
International Atomic Time, time shown by the world's atomic clocks.
TCG
--:--:--.---
Coordinated Geocentric Time. Time measured at the center of the Earth.
TCB
--:--:--.---
Barycentric Coordinated Time. Time measured at the barycenter of the Solar System.
TDT
--:--:--.---
Terrestrial Dynamic Time. Atomic time at the center of the Earth.
TDB
--:--:--.---
Barycentric Dynamic Time. Atomic time at the barycenter of the Solar System.
GAST
--:--:--.---
Greenwich Apparent Sidereal Time, right ascension of the bodies that are culminating in Greenwich.
LAST
--:--:--.---
Local Apparent Sidereal Time, right ascension of the bodies that are culminating in Greenwich.
TAI(s)
---'
------.---
UTAI Time. Number of seconds elapsed since January 1, 2000 at 0:00.
UNIX(s)
- ---'
------.---
UNIX Time. Number of seconds elapsed since January 1, 1970 at 0:00.
JD(d)
-------.
---------
Julian Date referred to UTC, days elapsed since January 1, 4713 BCE.
JDB(d)
-------.
---------
Julian Date referred to the barycenter, days elapsed since January 1, 4713 BCE referred to the barycenter of the Solar System.