Ok, I propose we do a simple research, and I will need your help.
To gather more "material" we will analyze the light at midday on meridian 15 east.
Please fill in the blanks, I will make some minute adjustments and draw the lines on the map.
At what time, on 21st March are the following events happening? Please use UTC times.
Irkutsk sunset
Ulanbaatar sunset
Chengdu sunset
Singapore sunset
Perth sunset
New York City sunrise
Port au Prince sunrise
Bogota sunrise
Lima sunrise
Santiago de Chile sunrise
Security question: is the sun shining during either of those events in:
London?
Tripoli?
Cape Town?