The longitude of London is 00 while that of Sydney,Australia is about 1500E. The time at Sydney would therefore be

The difference in longitude between London (0°) and Sydney (approximately 150°E) is 150 degrees. Since the Earth rotates 360 degrees in 24 hours, each degree of longitude corresponds to 4 minutes of time difference between two places. Therefore, to calculate the time difference between London and Sydney, we need to multiply the difference in longitude by 4. 150 degrees x 4 minutes/degree = 600 minutes or 10 hours So, Sydney is 10 hours ahead of London. If it is 12:00 pm (noon) in London, it would be 10:00 pm in Sydney on the same day. Conversely, if it is 12:00 pm (noon) in Sydney, it would be 2:00 am in London on the same day.