Chapter 1 -
Time computation on the ground surface
1. 1. Give a short answer-
(a) What is the total number of longitudes?
Answer: The total number of longitudes is 360 branches.
(b) What is the longitude of Indian Standard Time?
Answer: The longitude of Indian Standard Time is 82 miles almost right through India°30′ East longitude.
(c) How many hours does it take the earth to revolve around its spine?
Answer: It takes 24 hours for the Earth to revolve around its spine.
(d) What is the local time of the line of primary longitude imagined across Greenies?
Answer: Greenwich Mean Time is the local time of the primary line of longitude imagined across Greenwich.
(e) What is the unit of measurement of angular distance?
Answer: The unit of measurement of angular distance is degrees.
2. 2. Fill in the blanks.
(a) The circumference of the Earth is at the center ৩৬০॰ They keep making angles.
(b) Value or measure the longitude longitude They say.
(c) Angular distance of primary longitude degree longitude.
(d) At a distance of 15 degrees east of the noon sun 1 o'clock It will play.
3. 3. Determine true or false一
(a) The Earth's diurnal motion causes places in the west to face the Sun earlier than in the east.
Answer: lie.
(b) Add 1 day when the traveler crosses 180. from the east.
Answer: lie.
(c) When 12 o'clock at night in a place, one day ends and another day begins.
Answer: true.
(d) The time interval at 180. longitude is 12 hours.
Answer: true.
(e) A place where evening occurs later than Greenwich is located at western longitude.
Answer: true.
4. The Choose the correct answer.
(a) Travelers feel that they gain/lose time by going west of Greenwich according to Greenwich Standard Time.
Answer: Travelers feel that they save time by going west of Greenwich according to Greenwich Standard Time.
(b) The sun rises earlier in Mumbai than in Greenwich. So Mumbai is located in East / West longitude.
Answer: The sun rises earlier in Mumbai than in Greenwich. So East in Mumbai located in longitude.
(c) Time advance / delay of 4 minutes per degree of longitude east of primary longitude.
Answer: Time advance of 4 minutes per degree of longitude east of primary longitude.
(e) The ordinary watches we wear run according to local time /Greenland Standard Time /Indian Standard Time.
Answer: The ordinary watches we wear run according to Indian standard time.
5) Write the differences.
(a) Latitude and longitude.
Answer: Latitudes are determined by calculating the angular distances to both poles based on the equator. Axes are circular lines drawn parallel to the equator towards both poles.
Longitudes are lines imagined connecting the two poles east and west of the primary longitude.
(b) Local time and standard time.
Answer: Local time is the time calculated based on the position of the midday sun at a place.
To overcome the difficulty of calculating time, each country uses local time at one or more specific longitude lines. The standard time of a country is the calculation of time for an entire country based on one or more fixed longitudes.
Additional Questions:-
1. 1. What are latitude and longitude?
Answer: The value or measurement of the latitude is called latitude and the value or measurement of the longitude is called longitude.
2. 2. What is the angular distance between two places?
Answer: The angular distance between two points on the surface of a spherical body is the value of the angle formed at the center of the body.
3. 3. What is an axis?
Answer: The circular lines drawn parallel to the equator towards both poles are the axes.
4. The What Unit of measurement is used to determine the position of two places on a flat surface?
Answer: The unit of measurement, meter-centimeter, is used to determine the location of two places on a flat surface.
5. 5. How many degrees does the circumference of the earth angle at the center?
Answer: The circumference of the Earth makes an angle of 360. at the center.
6. 6. What is the value of the primary or major longitude?
Answer: The primary longitude value is degrees.
7. 7. What is a longitude?
Answer: The lines of longitude are those imagined joining the two poles east and west of the primary longitude.
8. 8. Which instrument can be used to determine the local time of the place where a ship arrives?
Answer:- Sextant devices can be used to determine the local time at the point where a ship has reached.
