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10-30-2010, 03:36 PM   #1
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Astronomical/Nautical/Civil Twilight & Blue/Golden Hour examples

You often see sunrise & sunset times in weather reports. But these times by themselves are not that useful for photography. Depending on the scene, different twilight times may be of more interest. I'm looking for contributions to a Pentax Forums article to illustrate the various forms of natural light and which periods suit different scenes.

Periods to be covered:

Name Dawn Period Dusk Period
Astronomical Twilight Astronomical Twilight time->Nautical Twilight time Nautical Twilight time->Astronomical Twilight time
Nautical Twilight Nautical Twilight time->Civil Twilight time Civil Twilight time ->Nautical Twilight time
Civil Twilight / "Blue Hour" Civil Twilight time->Sunrise time Sunset time->Civil Twilight time
"Golden Hour" Early Post-Sunrise Late Pre-Sunset

Definitions: Twilight, Golden Hour & Blue Hour

Free calculators: online (excellent user manual, handy PDF monthly chart printouts); offline (can show sun/moon positions throughout the day/night).

All contributions used will be attributed. Post links or examples here. Indicate geographical location, date, time of day and which period the shot occurs in (saves users having to work it out with a calculator). Perhaps Google Maps link too.

For the Golden Hour shots, it may be helpful to also show the same scene but taken outside this period. Chronological sequences might be good too.

Question: is there a difference in light quality between dawn & dusk? If so, is this solely due to the effect of the heat of the day causing wind & dust in the atmosphere (red sunsets) and the clearing of mist/atmospheric moisture (more mist = more bluish).

Dan


Last edited by dosdan; 10-30-2010 at 06:07 PM.
10-30-2010, 03:47 PM   #2
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1. In the Urangan Pier series (240 km North of Brisbane as the crow flies), the night-time shot was at 0351, light was appearing in the sky around 0405 & it was pretty much all over by 0421. This series was taken on the morning of the 26th December 2008, just after the Summer Solstice in the Southern Hemisphere (21st December), so it's an extreme example.

The official sunrise at Urangan on that day was 0457. The 0405 & 0421 shots occured during the Nautical Twilight period of 0400-0431.


2. This chronological sequence is of 5 post-sunset shots of the Brisbane CBD on 14 Dec 2009. The times were 1912, 1914, 1923, 1924, 1928. They are all within the Nautical Twilight period of 1906-1938.

Dan.

Last edited by dosdan; 10-30-2010 at 03:52 PM.
10-30-2010, 08:59 PM   #3
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Hi Dan,

Thank you very much for the links. I have been using others, that are not quite as nice. These are MUCH better!!

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