4. Answer the following questions.

1. When and how did large-scale international collaborations begin?

2. How often does the tiny black disk of the planet Venus transit across the face of the sun?

3. Who and when realised that this event was of truly cosmic significance?

4. Did astronomers of the 18th century know the relative distances of the planets from the sun?

5. What was the promise of the transit of Venus in 1761?

6. What is the “parallax method”?

7. Were the observations of 1761 successful?

8. Who was James Cook? What did he discover?

9. What was a single number of the distance between the Earth and the sun?

10. When was the last transit of Venus?