Question

Earth's rotation has enabled us to measure time in terms of *


Months

Days

Years​

Answer 1

Earth's rotation is the rotation of planet Earth around its own axis. Earth rotates eastward, in prograde motion. As viewed from the north pole star Polaris, Earth turns counterclockwise.

The North Pole, also known as the Geographic North Pole or Terrestrial North Pole, is the point in the Northern Hemisphere where Earth's axis of rotation meets its surface. This point is distinct from Earth's North Magnetic Pole. The South Pole is the other point where Earth's axis of rotation intersects its surface, in Antarctica.

Earth rotates once in about 24 hours with respect to the Sun, but once every 23 hours, 56 minutes, and 4 seconds with respect to other, distant, stars (see below). Earth's rotation is slowing slightly with time; thus, a day was shorter in the past. This is due to the tidal effects the Moon has on Earth's rotation. Atomic clocks show that a modern-day is longer by about 1.7 milliseconds than a century ago,[1] slowly increasing the rate at which UTC is adjusted by leap seconds. Analysis of historical astronomical records shows a slowing trend; the length of a day increased about 2.3 milliseconds per century since the 8th century BCE.[2]

Answer 2

Concept introduction:

The planet Earth revolves around its own axis, which is referred to as the Earth's rotation. The prograde motion of the Earth's rotation is eastward. Earth rotates counterclockwise when viewed from Polaris, the north pole star.

Explanation:

Given that, Earth's rotation has enabled us to measure time.

We have to find, how Earth's rotation helps in measuring days, months, years.

According to the question,

The Northern Hemisphere's North Pole is where the Earth's axis of rotation intersects its surface. It is also referred to as the Geographic North Pole or Terrestrial North Pole. The North Magnetic Pole of the Earth is not the same as this place. The Earth's axis of rotation also crosses the surface at the South Pole, which is located in Antarctica.

When compared to other, far-off stars, Earth spins once every $23$ hours, $56$ minutes, and $4$ seconds, as opposed to once every about $24$ hours when compared to the Sun (see below). A day used to be shorter because the Earth's rotation was slower back then. This is caused by the tidal influences the Moon has on the rotation of the Earth. Atomic clocks reveal that a current day is longer than one from a century ago by around $1.7$ milliseconds, which gradually accelerates the rate at which UTC is modified by leap seconds. The duration of a day has risen by around $2.3$ milliseconds every century since the eighth century BCE, according to an analysis of historical astronomical records, although this tendency is slowing down.

Final Answer:

By rotation and revolution and day night change we measure days, months, and years.

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