Equinox

One of the two

in the year when the

of the

are

, which

when the

of the Sun (the

)

with the

of the Earth; this

on a day between March 19 and 21 (spring in the Northern Hemisphere, and

in the Southern Hemisphere), and on another day between September 21 and 24 (autumn in the Northern Hemisphere, and

in the Southern Hemisphere); hence, the

time when the

.

The

of a

having the

of

length.

One of the

in

where the

of the Sun

with the

of the Earth.

A

(“very strong

”) once

to

more

around the time of an

(sense 1), now known to be a

; an

.

A

(“

on the

,

with the

of the Earth's

(the

)”); also, the Earth's

.