SUNSET: 
Will we ever see a mirror image of the conjunction of Venus and crescent Moon, as depicted on the Turkish flag?
On the evening of April 19th 2007, I witnessed a spectacular conjunction of Venus and the screscent Moon with earthshine. The cusps of the crescent pointed left (south) as the Moon set in the west. Will we ever see a mirror image of this event as depicted on the Turkish…
Should you set your digital camera to a low or high ISO value in twilight?
When I’m shooting a planetary grouping in twilight, should I set my digital camera to a low or a high ISO value? The easiest way to answer this question is to make test exposures of a skyline during twilight, with or without planets. Try all the available ISO values (analogous…
Will Mercury and Venus ever transit the Sun simultaneously?
Will Mercury and Venus ever transit the Sun simultaneously? Yes, but this will not happen until AD 69,163. A transit can take place only when Mercury or Venus is near an ascending or descending node, meaning a crossing point of its orbit on the plane of the ecliptic. For this…
