Longitude and Time.

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Presentation transcript:

Longitude and Time

Imagine clocks did not exist…..what would you base time on?

Solar Noon Sunrise Sunset Solar Time – Solar Noon –

What did the early clocks look like? Sundial

Review Longitude Lines

Do students in California get up when you get up for school?

Time = Longitude!!

Earth’s Rotation Earth Rotates ___o in 24 hours 360o/24hrs = __o per hour

Standard Time Zones What is the amount of time difference between each time zone? 1 hour Every 15o longitude is a new time zone. How many time zones are there? 24 hours in one day… there are 24 time zones!

Map of 24 Hour Time Zones

Determining Longitude

1st: -

A chronometer is a clock set to the local time at Greenwich, just outside of London.

2nd: - Local time best found at Solar Noon (12 noon) Sextant

3rd: Multiply by -0/hr

4th: - If GMT is later in the day compared to local time – you are west If GMT is earlier in the day compared to local time - you are east

East sees daylight first! West last to see daylight! Prime Meridian Sun

2pm is later in the day than 12 noon - Example 1 GMT = 2 pm Local Time = 12 noon What is your longitude? 2 hours*15° = 30° 2pm is later in the day than 12 noon - 30°W

The Prime Meridian is later in the day than local time. 2pm 12pm The Prime Meridian is later in the day than local time.

GMT = 8 am Local Time = 12 noon What is your Longitude? -* -° = -° -

Final Question GMT = 10 pm Local Time = 12 noon What is your Longitude? -* -° = -° - Final Question