Hobby-based Q&A

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…

Twilight view, September 6th

Astronomy Questions & Answers

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…

Mercury near the Sun's limb

Astronomy Questions & Answers

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…

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