What is the length of the lunar day?

Question 1 / 2707066636ee928f7522a1c519a4e

Question 1 of 2707066636ee928f7522a1c519a4e

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Question 1 of 27070

Q

What is the length of the lunar day?

🔍 Key Concepts

• Lunar day vs solar day (what each one is measured by) • How long it takes Earth to rotate once relative to the Moon instead of the Sun • Effect of this difference on the time between two consecutive high tides at the same place

💭 Think About

• Think about why the times of high tide occur later each day and by roughly how much time they are delayed. • Compare the idea of a normal 24‑hour day (based on the Sun) with the time it takes for the Moon to return to the same position over a point on Earth. • Ask yourself: if the Moon is moving in its orbit while Earth is rotating, does the Earth have to turn a little more or a little less for the Moon to be overhead again, and how does that change the total length of the lunar day?

✅ Before You Answer

• Be clear on the difference between a solar day (noon to noon) and a sidereal day (relative to distant stars) and a lunar day (relative to the Moon). • Recall approximately how much later (in minutes) successive high tides occur each day at a given port. • Make sure the option you pick is longer than a standard solar day if you conclude the Earth must rotate a bit extra to ‘catch up’ to the Moon.

Question 1 of 27070

Q

What is the length of the lunar day?

A

24h 50m 00s

B

23h 56m 04s

C

23h 03m 56s

D

24h 00m 00s

Question 1 / 2707066636ee928f7522a1c519a4e

Question 1 of 2707066636ee928f7522a1c519a4e

What is the length of the lunar day?

Back

Question 1 of 27070

Q

What is the length of the lunar day?

🔍 Key Concepts

• Lunar day vs solar day (what each one is measured by) • How long it takes Earth to rotate once relative to the Moon instead of the Sun • Effect of this difference on the time between two consecutive high tides at the same place

💭 Think About

• Think about why the times of high tide occur later each day and by roughly how much time they are delayed. • Compare the idea of a normal 24‑hour day (based on the Sun) with the time it takes for the Moon to return to the same position over a point on Earth. • Ask yourself: if the Moon is moving in its orbit while Earth is rotating, does the Earth have to turn a little more or a little less for the Moon to be overhead again, and how does that change the total length of the lunar day?

✅ Before You Answer

• Be clear on the difference between a solar day (noon to noon) and a sidereal day (relative to distant stars) and a lunar day (relative to the Moon). • Recall approximately how much later (in minutes) successive high tides occur each day at a given port. • Make sure the option you pick is longer than a standard solar day if you conclude the Earth must rotate a bit extra to ‘catch up’ to the Moon.