Unit 4- Time + The Earth Moon Sun System

Question 1

What does it mean if the EOT is + or -?

Answer 1

+ means the sun is fast
- means the sun is slow

Question 2

What is the difference in the speed of the sun on dates near the equinoxes compared to dates near solstices?

Answer 2

On dates nearer to the solstices, the Sun travels FASTER EAST TO WEST compared to the dates near an equinox, where the Sun spends more time travelling NORTHWARDS and SOUTHWARDS

Question 3

What is the equation for the EOT?

Answer 3

EOT= AST + MST

Question 4

What happens to the sun’s upper limb during sunrise and sunset?

Answer 4

During sunrise, the Sun’s upper limb APPEARS above the horizon
During sunset, the Sun’s upper limb DISAPPEARS below the horizon

Question 5

Give the dates for: 1.) The Winter Solstice 2.) The Spring Equinox 3.) The Summer Solstice 4.) The Autumn Equinox

Answer 5

1.) December 21st
2.) March 21st
3.) June 21st
4.) September 21st

Question 6

How many hours of daylight do you get in LONDON during the solstices and equinoxes?

Answer 6

Winter Solstice= 7.5 hours
Spring Equinox= 12 hours
Summer solstice= 15.5 hours
Autumn equinox= 12 hours

Question 7

Where does the Sun rise and during the equinoxes and the summer and winter solstice?

Answer 7

EQUINOXES= Sun rises EXACTLY EAST and sets EXACTLY WEST
WINTER SOLSTICE= Sun rises SOUTH EAST and sets SOUTH WEST
SUMMER SOLSTICE= Sun rises NORTH EAST and sets NORTH WEST

Question 8

What happens if you didn’t know the longitude at sea?

Answer 8

Can result in ships crashing, losing lives and merch

Question 9

What did John Harrison invent?

Answer 9

The H4- the ‘Sea Watch’
It was the most accurate clock for maritime use in its day