a century
1.8 million year ago
A year. unless thats not what you meant
The period of time closely following a marriage is often referred to as the "Honeymoon" period. It is recognized as a time of little conflict in a relationship.
365.25 days (rounded. That's the period of time we call "one year".
It COULD be called a Gigayear, but in practice it is simply called "a billion years".
365.24 days. We have a special name for that period of time. We call it a "year".
It has no individual name
Seasons
Roughly 3651/4 days. It's the period of time that we call a "year".
In rounded numbers, 365.25636 days. It's the period of time we call a "year".
A light year is NOT a period of time. It is a distance of about 5.86 trillion miles.