Lecture 6 unit 3 Size of the Earth .pptx

Size of the Earth

1. Size of the Earth Class: ADP II Semester QAU Islamabad Syed Abbas Hyder Shah Lecturer in Geography IMCG, Humak, Model Town Islamabad

2. Size of the Earth Understanding Earth's Dimensions and Scale

3. Introduction to Earth's Size Earth is not a perfect sphere; it has an equatorial bulge.

4. Earth's Diameter and Circumference Equatorial Diameter: 12,756 km Polar Diameter: 12,712 km Equatorial Circumference: 40,075 km

5. Geodesy – Measuring Earth's Size The study of Earth's shape and size is called Geodesy.

6. Eratosthenes’ Calculation Used shadows in Syene and Alexandria to estimate Earth's circumference.

7. Earth's Size Compared to Other Planets Earth is the 5th largest planet in the Solar System. Jupiter is 11 times wider than Earth.

8. Horizontal & Vertical Dimensions Horizontal: Distances between surface points. Vertical: Elevation and depth measurements.

9. Earth's Circumference and Navigation Importance of knowing Earth's circumference for navigation.

10. The Geoid Shape of Earth Earth is an oblate spheroid, not a perfect sphere.

11. Summary & Conclusion Earth’s size has been studied for centuries. Measurements have improved with technology.