- 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...
-
thousand years or one
hundred decades or ten centuries,
sometimes called a
kiloannum (ka), or
kiloyear (ky). Normally, the word is used
specifically for periods...
-
substitutions at a DNA site, used in Ka/Ks
ratio Ka tree,
Terminalia carolinensis kiloannum or
kiloannus (ka), a unit of time
equal to one
thousand (103)
years Keepalive...
-
Paleoarchean (3.2–3.6 Ga)
Eoarchean (3.6–4 Ga)
Hadean Eon (4–4.6 Ga) ka =
kiloannum (thousand
years ago); Ma =
megaannum (million
years ago); Ga = gigaannum...
-
Paleoarchean (3.2–3.6 Ga)
Eoarchean (3.6–4 Ga)
Hadean Eon (4–4.6 Ga) ka =
kiloannum (thousand
years ago); Ma =
megaannum (million
years ago); Ga = gigaannum...
- Australopithecus,
direct ancestor to
modern Homo sapiens,
appear 200 ka (
kiloannum:
thousand years ago):
First modern Homo
sapiens appear in East Africa...
- some
preferring to use "ky". ISO 80000-3
recommends usage of ka (for
kiloannum),
which avoids the
implicit English bias of "year" by
using a
Latin root...
-
Paleoarchean (3.2–3.6 Ga)
Eoarchean (3.6–4 Ga)
Hadean Eon (4–4.6 Ga) ka =
kiloannum (thousand
years ago); Ma =
megaannum (million
years ago); Ga = gigaannum...
-
commonly used by
geologists are Ga (gigaannum,
billion years), and ka (
kiloannum,
thousand years), with the
latter often represented in
calibrated units...
- this timeline, Ma (for megaannum)
means "million
years ago," ka (for
kiloannum)
means "thousand
years ago," and ya
means "years ago." 4540 Ma – 4031...
