- A year is the time
taken for
astronomical objects to
complete one orbit. For example, a year on
Earth is the time
taken for
Earth to
revolve around the...
-
Million years ago,
abbreviated as Mya, Myr (me****ear) or Ma (
megaannum), is a unit of time
equal to 1,000,000 years (i.e. 1×106 years), or 31.556926 teraseconds...
-
periods are then
expressed by
using metric prefixes with the annum, such as
megaannum (Ma) or
gigaannum (Ga).[citation needed] The SI unit of
angle is the radian...
- Ga)
Hadean Eon (4–4.6 Ga) ka =
kiloannum (thousands
years ago); Ma =
megaannum (millions
years ago); Ga =
gigaannum (billions
years ago). See also: Geologic...
- Ga)
Hadean Eon (4–4.6 Ga) ka =
kiloannum (thousands
years ago); Ma =
megaannum (millions
years ago); Ga =
gigaannum (billions
years ago). See also: Geologic...
- refined. The
numeric values on the ICC are
represented by the unit Ma (
megaannum)
meaning "million years", i.e., 201.4 ± 0.2 Ma, the
lower boundary of...
-
Megaampere (MA), a
multiple of the SI unit of
electric current, the
ampere Megaannum (Ma), one
million years Milliampere (mA), a
multiple of the SI unit of...
-
photosynthesis c. 2.3 Ga:
Oxygenated atmosphere,
first snowball Earth 730–635 Ma (
megaannum:
million years ago):
second snowball Earth 541 ± 0.3 Ma:
Cambrian explosion...
- glaciation,
changes in sea level, and
impact events. In this timeline, Ma (for
megaannum)
means "million
years ago," ka (for kiloannum)
means "thousand
years ago...
-
timeline of
selected dinosaurs from the list above. Time is
measured in Ma,
megaannum,
along the x-axis.
Dinosaurs portal India portal List of
birds of India...
