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CPL - Navigation > Time > Flashcards

Time Flashcards

1
Q

The basic unit of time is known as the ….. ….. …..

A

mean solar day

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2
Q

A solar day doesnt quite correspond to …..

A

a solar day becasuse the earth moves forward as it rotates

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3
Q

Since the speed of the earths rotation varies so does the ……

A

length of a mean solar day throughout the year

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4
Q

Time measured at a meridian is reffered to as

A

LMT

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5
Q

Because all meridians are different we work time into ….. …..

A

time zones

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6
Q

Eastern Australia uses the ….. meridian

A

1500E

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7
Q

Central Australia including Broken Hill uses the ….. meridian

A

142030’E

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8
Q

Western Australia uses the ….. meridian

A

1200E

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9
Q

The earth rotates 3600 per day so it travels ….. per hour

A

150

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10
Q

Define how to work out how many hours from UTC a meridian is

A

Take the meridians location eg 1500

Divide the meridian by 40

this will give you the hours ahead or behind UTC

EG

1500E / 150ph = 10 hours ahead of UTC

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11
Q

Converting a meridians location to hours is known as ….

A

Arc to Time Conversion

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12
Q

In aviation how big is the date time group?

A

usually just 6 figures since the year and month are said to be understood

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13
Q

BOD / EOD

Define ‘Civil Twilight’

A

it is the time before sunrise and after sunset when the sun is within 60 of the observers horizon

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14
Q

Define ‘Astronomical Twilight’

A

this extends to 180 below the observers horizon

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15
Q

BOD commences when …..

A

at the commencement of civil twilight

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16
Q

EOD occurs at the end of …..

A

civil twilight

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17
Q

at latitudes other than the equator the suns apparent path is …..

A

inclined from the vertical angle equal to the observers latitude and is never exactly overhead

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18
Q

Twilight

The inclination of the suns apparent path at ….. ….. means that it has to travel a …… ….. and takes ……

A

higher latitudes means that it has to travel a greater distance and takes longer

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19
Q

Twilight

At the equator the duration of twilight is …. …. and darkness follows about ….. ….

A

very short and darkness follows about 10 minutes after sunset

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20
Q

In the southern hemispher:

In summer the sun rises …. …..

In winter the sun rises …. ….

At the equinox …..

A

Summer = further south of east

Winter = Further north of east

At the equinox it is exactly in the east but never exactly overhead because of the latitude

21
Q

Because the earth tilts toward and away from the sun during the various seasons the BOD and EOD will occur at ….. LMTs for the same locations on different dates

A

different

22
Q

also because of the earths tilt BOD and EOD may be ….. for different locations on the ….. …..

A

different for different locations on the same date

23
Q

The winter solstice is the …. ….. of the year and occurs around ……

A

shortest day of the year and occurs around the 20th or 21st of June

24
Q

The summer solstace is the …… day of the year and occurs around the ……

A

longest day of the year and occurs around the 21st or 22nd of December

25
Q

Which days caus the greatest variation of BOD and EOD for different locations/

A

the solstice

26
Q

The spring and Autum equinox occur …..

A

spring = September 22nd or 23rd

Autumn March 20th 21st

27
Q

During the spring and autumn equinox what happens to the days and nights?

A

They are of equal length and every location on earth experiences the BOD and EOD at the same LMT

28
Q

Why dont the solstice’s occur at the same date each year?

A

It is because there is not an exact whole number of days in a year because of the earths orbit around the sun.

29
Q

On the BOD and EOD graph the point where all the lines converge is known as the …..

A

Equinox and represents the time when BOD and EOD is the same everywhere

30
Q

On the BOD and EOD graphs the greatest seperation in lines means ……

A

The time when the solistace is occuring

31
Q

Describe the matrix to find BOD ……

A
  1. Find the date
  2. Find the latitude
  3. Note the LMT
  4. Convert the longitude - Arc to time
  5. Subtract the Arc to Time conversion from LMT
  6. You have UTC
  7. Convert the UTC to LMT by adding EST, CST or WST
32
Q

During winter in the southern hemispher the LMT of EOD would occur earlier at the destination than at the departure point for a flight which travels …..

A

South

33
Q

The duration of daylight experienced by the occupants of an aircraft is less than experienced at the departure point for a flight which travels …..

A

East

34
Q

For a flight which travels south in the southern hemisphere on the autumn equinox the LMT of EOD would occur at …. ….. ….. at the ….. as the ….. …..

A

the same time at the destination as the departure point

at the equinox the EOD and BOD is the same at all latitudes

35
Q

Places on the same meridian will always have te same LMT for BOD on any given day

T/F

A

False

this only occus at the equinox

36
Q

Places on the same parallel of latitude will always have the same LMT for BOD on any given day

T/F

A

True

The only factors that determin the BOD are latitude and date

37
Q

The longest night of the year occurs at …..

A

the winter solistace

38
Q

The LMT of BOD would be earlier at the destination than at the departure point in the southern hemisphere for a flight which travels …..

A

south in summer

If the LMT of BOD gets earlier the days are getting longer. This occurs as you travel south in the summer

39
Q

Morning civil twilight commences when …..

A

the sun is 60 below the horizon

40
Q

The duration of the periof of twilight …..

A

increases as latitudes increase

41
Q

The longest day of the year is the ….

A

summer solistace

42
Q

The passengers and crew of a flight which travels east on a given date will experience ….. hours of daylight than the people at the …..

A

fewer hours of daylight than the people at the departure point and the destination

43
Q

The time taken to cross 2 consecutive meridians is …..

A

4 minutes

The earths rotates 3600 in 24-hours. That’s 150 every hour. 150 into 60 minutes = 4 minutes per degree.

44
Q

As you fly south in winter the days get …..

A

shorter

45
Q

As days get shorter the EOD would be sooner in Sydney/Cairns and therefore later in Sydney/Cairns

A

Sydney then cairns

46
Q

A day VFR flight should not depart if the planned ETA at the destination is later than …..

A

10 minutes before the EOD

AIPENR 1.2.1

47
Q

The occupants of an aircraft will experience more hours of daylight than the people at the departure point or destination if the aircraft travels …..

A

west

48
Q

On the date of the spring equinox BOD and EOD will occur at …..

A

the same time for observers on the same meridian

every location on earthe will experience the EOD and BOD at the same time!

CPL - Navigation (9 decks)

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