# Lesson Notes By Weeks and Term - Senior Secondary 1

Latitude and Longitude 2

TERM – 1ST TERM

WEEK FIVE

Class: Senior Secondary School 1

Age: 15 years

Duration: 40 minutes of 5 periods each

Date:

Subject: Geography

Topic: Latitude and longitude 2

SPECIFIC OBJECTIVES: At the end of the lesson, pupils should be able to

1. Calculate the distance of places using the lines of Latitude.
2. Calculate the local time of places using the lines of Longitude
3. Explain how international dateline, standard time and world time zones account for differences in time and dates globally

INSTRUCTIONAL TECHNIQUES: Identification, explanation, questions and answers,

demonstration, videos from source

INSTRUCTIONAL MATERIALS: Videos, loud speaker, textbook, pictures

INSTRUCTIONAL PROCEDURES

PERIOD 1-2

 PRESENTATION TEACHER’S ACTIVITY STUDENT’S ACTIVITY STEP 1 INTRODUCTION The teacher explain and show students how to calculate distance of places using the lines of latitude Students in pairs, calculate the distance of places  using lines of latitude STEP 2 EXPLANATION Teacher explain and show students how to calculate local time of places using lines of longitude. Students in small group calculate the local time of places using the lines of Longitude STEP 3 DEMONSTRATIO N Teacher explain how international dateline, standard time and world time zones account for differences in time and dates globally Students as a class explain how international dateline, standard time and world time zones account for differences in time and dates globally. STEP 4 NOTE TAKING The teacher writes a summarized note on the board The students copy the note in their books

NOTE

LATITUDE AND LONGITUDE

Calculate the distance of places using the lines of Latitude

Procedures

I. Locate the two processes involved

II. Find the latitude difference between two places involved the formulaused.

1. North-North = Subtract
2. South –South = subtract
4. Equator –North/South = Add or Subtract
5. Multipy the Latitude difference by 111

Example 1. Calculate the distance between the equator (Lat00) and Egypt (300N)

Solution

I. Locate the two places involved

Latitude of equator = 00

Latitude of Egypt = 300N

II. The difference in latitude: 00+ 300= 30

Since 10 = 111km

Therefore, 300 = 111 x 30

= 3,330km

Example 2. Calculate the distance between Lagos (40N) and Cairo (300N)

Solution

I. Locate the two places involved

Latitude of Lagos = 40N

Latitude of Cairo = 300N

II. Latitude difference= 300N –40N = 260

Since 10 = 111km

Therefore 260= 111km x 260= 2886km

The distance between the equator and Egypt is 3,330km

Procedures for calculating local time

1. Locate the places involved in the question
2. Find the longitude difference
3. Convert the longitude difference to time
4. Adjust the time according tothe direction of movement (West or East)

Example 3: What will be the local time in Nigeria (longitude 150E) when it is 5:00pm in Ethiopia(Longitude 450E)

Solution

First, Locate the places invoved in the question.

Nigeria(150E) - ?

Ethiopia (450E) –5:00pm

NOTE: There are two lines. Nigeria has to come first before Ethiopia because the longitude increases from 00 to 1800E Eastward. So, 150E come first before 450E

Secondly, find the longitude difference, which is:

1. East east = Subtract
2. West west = Subtract
4. Greenwich Meridian (00) West or East = Add or Subtract

From the question, both countries, longitude are in the East (i.e. 150E and 450E) so we have to subtract.

Hence, the longitude difference is 450E –150E = 300

Now, connect the longitude difference to time

3600= 24 hours

150 = 1 hour

10 = 4 minutes

From the question, the longitude difference is 300, therefore 300 should be connected to time, since 150 = 1 hour

Therefore, 300/150 = 2 hours

OR

300 x 4 min/ 60 = 120/60 = 2 hours

International dateline, Standard time and World time zones

The International Date Line (IDL) is an imaginary line located at approximately 180 degrees longitude. It marks the transition from one calendar day to the next. When you cross the IDL from west to east, you subtract a day, and when you cross from east to west, you add a day. This accounts for differences in dates globally.

Standard time is based on dividing the world into time zones, each 15 degrees of longitude apart. The Earth is divided into 24 time zones, and within each zone, the time is generally the same. This helps coordinate activities globally and standardizes timekeeping.

World time zones ensure that regions within the same time zone share a common standard time, reducing confusion and allowing for coordinated activities. It's important for global communication, transportation, and other international interactions.

EVALUATION: 1. If the distance between Lagos (40N) and Bamako is 1,665, what latitude is Bamako, assuming that Lagos and Bamako are in the same hemisphere?

1. Find the longitude of a Town Y whose time is 8:00 am when the time of another town X (longitude 300E) is 2:00 pm the same day.
2. Discuss how international dateline, standard time and world time zones account for differences in time and dates globally

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively