Sunspot drawing

Five days later, the Korean astronomer saw the northern lights above his country, so this is also the first prediction of coronal mass ejection.

[4][5] The Mount Wilson observatory started drawing sunspots by hand in 1917.

The early drawers did not draw their shapes and positions very accurately because they wanted just to mark where the sunspots were on the magnetic data.

However, in modern times, the drawers became very accurate and sunspot drawing became art; sometimes they needed many hours to complete work.

The easiest way to draw sunspots is to project the image of the Sun to the screen.

[9] One less accurate way to do this is to buy the special filter for blocking the light from the Sun.