GEOG 140

Introduction to Physical Geography

Lab 1: Longitude, Latitude, and Time

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Lab 1a: Longitude

The local time and Greenwich time are given for the following places. Determine longitude. Click here for a summary of the lecture on the process. 

     #  | local  | Greenwich | difference | Greenwich  |  difference | direction
        | time   |   time    |  in time   | is earlier |      in     |  E or W?
        |        |           |            | or later?  |  longitude  | 
        |        |           |            |            |             |
     ex.| noon   |  16:00    |    04:00   |   later    |    60°      |    W
     ___________________________________________________________________________
      1 | "  "   |  09:00    |            |            |             |
     ___________________________________________________________________________
      2 | "  "   |  19:08    |            |            |             |
     ___________________________________________________________________________
      3 | "  "   |  02:00    |            |            |             |
     ___________________________________________________________________________
      4 | "  "   |  13:45    |            |            |             |
     ___________________________________________________________________________
      5 | "  "   |  21:12    |            |            |             |
     ___________________________________________________________________________
      6 | "  "   |  23:36    |            |            |             |
     ___________________________________________________________________________
      7 | "  "   |  01:45    |            |            |             |               
     ___________________________________________________________________________     
      8 | "  "   |  12:30    |            |            |             |               
     ___________________________________________________________________________     
      9 | "  "   |  04:48    |            |            |             |               
     ___________________________________________________________________________     
     10 | "  "   |  06:40    |            |            |             |               
     ___________________________________________________________________________
I would never do anything this nasty on a quiz, but, if you're feeling particularly ambitious, try your hand at these. 
     
     ___________________________________________________________________________
     11 | 14:00  |  07:30    |            |            |             |
     ___________________________________________________________________________
     12 | 08:00  |  11:45    |            |            |             |
     ___________________________________________________________________________
     13 | 01:15  |  23:19    |            |            |             |
     ___________________________________________________________________________
     14 | 20:00  |  02:00    |            |            |             |
     ___________________________________________________________________________
     15 | 08:00  |  23:56    |            |            |             |
     ___________________________________________________________________________

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Lab 1b: Latitude

The date and sun angle are provided for the following cases. Find the declination of the sun for each date and then calculate "your" latitude. Click here for a summary of the lecture on the process. 

L = 90° - S + D  (where:  S is Sun angle, D is Declination)  
            -


     #   | Date     |   Sun angle            | Guess |  Declination   |  Latitude
         |          |                        | hemis |                | 
     ____________________________________________________________________________
     ex. | 10 Oct.  |   60° from S. horizon  |   N   |     6° S       |   24° N
     ____________________________________________________________________________
      1  | 24 Sep.  |   40° from S. horizon  |       |                |
     ____________________________________________________________________________
      2  | 24 Sep.  |   83° from S. horizon  |       |                |
     ____________________________________________________________________________
      3  | 22 Mar.  |   90°                  |       |                |
     ____________________________________________________________________________
      4  | 22 Jun.  |   90°                  |       |                |
     ____________________________________________________________________________
      5  | 23 Dec.  |    0° from S. horizon  |       |                |
     ____________________________________________________________________________
      6  | 20 Aug.  |   58° from S. horizon  |       |                |
     ____________________________________________________________________________
      7  |  1 Nov.  |   62° from N. horizon  |       |                |
     ____________________________________________________________________________
      8  | 22 Mar.  | 55°30' from S. horizon |       |                |
     ____________________________________________________________________________
      9  | 23 Dec.  | 32°30' from N. horizon |       |                |
     ____________________________________________________________________________
     10  | 26 May   | 14°15' from S. horizon |       |                |
     ____________________________________________________________________________
     11  | 24 Jul.  |   78° from N. horizon  |       |                |
     ____________________________________________________________________________
     12  |  1 Feb.  | 54°15' from N. horizon |       |                |
     ____________________________________________________________________________
     13  |  1 Jun.  |  5°30' from N. horizon |       |                |
     ____________________________________________________________________________
     14  | 22 Oct.  | 52°45' from S. horizon |       |                |
     ____________________________________________________________________________
     15  | 23 Dec.  |   10° from N. horizon  |       |                |       
     ____________________________________________________________________________

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Lab 1c: Time

This part of the lab focuses on the relationship between time and longitude, eventually allowing you to tackle the airplane flight questions in section 3.

  1. Longitude and Time:

    a.
    What standard time is it in Ndjamena, Chad (15° E) when it is 9 am on a Wednesday in Durango, Mexico (105° W)? _________________________

    b.
    What standard time of which day is it in Osaka, Japan (135° E) when it is 9 pm on a Saturday in Fresno, CA (120° W)? _________________________

  2. Central Meridians and Time Zones:

    a.
    Consider the time zone eight hours earlier than Greenwich ...
    i.
    What is the longitude of its central meridian? _________________________

    ii.
    Give the longitudes of its (theoretical) boundaries. _________________________
    b.
    What is the central meridian for the time zone in which Adelaide, Australia (139° E) is located? _________________________

    c.
    What is the central meridian for Chicago (88° W)? _________________________

  3. Travel, Time, and Longitude:

    Click here for a summary of the lecture on the process of finding arrival times for plane flights.

    a.
    At which standard time and day will a plane arrive in Denver (104°30'W) if it leaves Burbank (118°10'W) at 7 am, Friday, and the flight takes two and a half hours? _________________________

    b.
    At which standard time and day will a plane arrive in NYC (74° W) if it leaves Helsinki (25° E) at 9:30 am Thursday and the flight takes twelve and a half hours? _________________________

    c.
    At which standard time and day will a plane arrive in Vladivostok, Russia (132° E) if it leaves Kiev, Ukraine (30°30'E) at 6 am Tuesday and the flight takes 13 hours? _________________________

    d.
    At which standard time and day will a plane arrive in Honolulu (158° W) if it leaves Tokyo (140° E) at 7 am Monday and the flight takes 6 hours? _________________________

    e.
    At which standard time and day will a plane arrive in Auckland, New Zealand (175° E) if it leaves Vancouver, BC (122°30'W) at 9 am Wednesday and the flight takes 14 hours? _________________________

    f.
    At which standard time and day will a plane arrive in Los Angeles (118° W) if it leaves Sydney, Australia (151°30'E) at 8 pm Thursday and the flight takes 14 hours? _________________________

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    This document is maintained by Dr. Rodrigue
    First designed: 09/80
    First placed on Web: 09/18/00
    Last Updated: 02/10/01

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