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3. Navigation > Chapter 3 > Flashcards

Chapter 3 Flashcards

1
Q

How long does it take for the earth to rotate 360 degrees?

A

24 hours

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2
Q

How long does it take the earth to rotate 15 degrees

A

1 hour

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3
Q

How long does it take the earth to rotate 1 degrees?

A

4 mins

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4
Q

What does LMT stand for?

A

Local Mean Time

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5
Q

If a meridian is East of an observer is it ahead or behind the LMT?

A

Ahead

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6
Q

If a meridian is West of an observer is it ahead or behind the LMT?

A

Behind

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7
Q

How much does the earth turn every minute?

A

15’

1degree divided by 4

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8
Q

1 degree = ? Minutes

A

4 minutes

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9
Q

1’ = ? Seconds

A

4 seconds

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10
Q

Standardised time is where…

A

Clocks in a geographic region are synchronised

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11
Q

What does UTC stand for?

A

Universal time coordinate

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12
Q

BMT means?

A

British Mean Time

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13
Q

If British Mean Time has a 0 UTC offset then what is British Summer Time?

A

UTC+1 (daylight savings)

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14
Q

What is the international dateline?

A

When you cross it the date changes

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15
Q

If you cross the international dateline east to west what happens?

A

You subtract a day

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16
Q

If you cross the international dateline west to east what happens?

A

You add a day

17
Q

If two places have a UTC offset of UTC -10 and UTC +13 what is the time zone difference?

A

+/- 23 hours (depending on which way you go)

18
Q

When is sunrise?

A

When the upper limb of the sun appears on the horizon

19
Q

When is sunset?

A

When the upper limb of the sun disappears below the visible horizon

20
Q

When is sunlight?

A

Between sunrise and sunset

21
Q

What is the suns upper limb?

A

The first or last visible part of the sun

22
Q

What is twilight?

A

The incomplete light before sunrise or sunset

23
Q

When is civil twilight?

A

From sunrise/ sunset until the suns upper limb is 6 degrees below the horizon

24
Q

How many degrees does the earth rotate per hour?

A

15 degrees per hour

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