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Normandy Sunrise & Sunset Times


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Team!

 

I LOVE the map and detail that has gone into the map. I have one small issue and that is the sun is up on June 6 at like 4am which is inaccurate. I have the Sunrise & Sunset table for June here.

 

Jun Sunrise Sunset

1 5:57 am ↑ (54°) 9:54 pm ↑ (306°)

2 5:56 am ↑ (53°) 9:55 pm ↑ (307°)

3 5:56 am ↑ (53°) 9:56 pm ↑ (307°)

4 5:55 am ↑ (53°) 9:57 pm ↑ (307°)

5 5:55 am ↑ (53°) 9:58 pm ↑ (307°)

6 5:54 am ↑ (53°) 9:59 pm ↑ (307°)

7 5:54 am ↑ (52°) 10:00 pm ↑ (308°)

8 5:53 am ↑ (52°) 10:00 pm ↑ (308°)

9 5:53 am ↑ (52°) 10:01 pm ↑ (308°)

10 5:53 am ↑ (52°) 10:02 pm ↑ (308°)

11 5:52 am ↑ (52°) 10:02 pm ↑ (308°)

12 5:52 am ↑ (52°) 10:03 pm ↑ (308°)

13 5:52 am ↑ (52°) 10:04 pm ↑ (308°)

14 5:52 am ↑ (52°) 10:04 pm ↑ (308°)

15 5:52 am ↑ (51°) 10:04 pm ↑ (309°)

16 5:52 am ↑ (51°) 10:05 pm ↑ (309°)

17 5:52 am ↑ (51°) 10:05 pm ↑ (309°)

18 5:52 am ↑ (51°) 10:06 pm ↑ (309°)

19 5:52 am ↑ (51°) 10:06 pm ↑ (309°)

20 5:52 am ↑ (51°) 10:06 pm ↑ (309°)

21 5:52 am ↑ (51°) 10:06 pm ↑ (309°)

22 5:52 am ↑ (51°) 10:07 pm ↑ (309°)

23 5:53 am ↑ (51°) 10:07 pm ↑ (309°)

24 5:53 am ↑ (51°) 10:07 pm ↑ (309°)

25 5:53 am ↑ (51°) 10:07 pm ↑ (309°)

26 5:54 am ↑ (51°) 10:07 pm ↑ (309°)

27 5:54 am ↑ (52°) 10:07 pm ↑ (308°)

28 5:55 am ↑ (52°) 10:07 pm ↑ (308°)

29 5:55 am ↑ (52°) 10:06 pm ↑ (308°)

30 5:56 am ↑ (52°) 10:06 pm ↑ (308°)

 

This really makes it hard to "re-create" actual events. Would it be possible to have this updated?

 

Many Thanks

 

Harv:thumbup:

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Depend on whose time zones are being referenced.

 

Britain (and ergo the Allies) were operating on UTC+2 during the Invasion period. Germany instituted DST in occupied France.

 

I suspect the map might be UTC and the times you reference are UTC+2.


Edited by DD_Fenrir
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Depend on whose time zones are being referenced.

 

Britain (and ergo the Allies) were operating on UTC+2 during the Invasion period. Germany instituted DST in occupied France.

 

I suspect the map might be UTC and the times you reference are UTC+2.

 

You are correct.

 

That table is in British Double Summer Time

 

https://skyandtelescope.org/astronomy-news/astronomy-d-day-sun-moon-tides/

 

Sunrise on D-Day was 3:57 AM GMT

 

 

 

 

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Sunrise on D-Day was 3:57 AM GMT

 

What do you mean by GMT?

 

Actual mean time in Greenwich on 6th June 1944 (= UTC+2)?

British Standard (Winter) Time in 1944 (= UTC +1)?

Or UTC?

 

As the UK changed its time zone during the war, and that the invasion occurred during "daylight savings" time, makes GMT rather ambiguous.

 

From the link you gave, I presume it is 03:57 UTC.

 

But there is then the additional complication of what timezone is being used in DCS.


Edited by xvii-Dietrich
Fixed the formatting
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Today GMT = UTC +/-0.00 Always. UTC +1 = BST always.

 

In 1944 GMT = GMT Always. For military time zones GMT = ZULU...Always.

UTC did not exist until the 60's and reading historical documents can be confusing, particularly for amateur historians making sense of differing accounts of a battle. In the 19th C even Calendars were reckoned differently never mind time on such a small scale as hours.

 

The times on the Normandy Map are correct for local time in Normandy in June 1944. The problem for allied mission designers is the same as it is for historians, convert Allied accounts to local time!

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What do you mean by GMT?

 

Actual mean time in Greenwich on 6th June 1944 (= UTC+2)?

British Standard (Winter) Time in 1944 (= UTC +1)?

Or UTC?

 

As the UK changed its time zone during the war, and that the invasion occurred during "daylight savings" time, makes GMT rather ambiguous.

 

From the link you gave, I presume it is 03:57 UTC.

 

But there is then the additional complication of what timezone is being used in DCS.

 

GMT or Greenwich Mean Time does not change. It has been the world reference for navigation purposes for a few centuries now. A system of Zone Time was also developed based upon what was then called Greenwich Mean Time. The zones started with the zone east of the zone Greenwich is in and are represented by letters, beginning with A. This lettering continues east halfway and then west halfway. Greenwich is in Zone Z. The letter J is skipped. The phonetic alphabet word for Z is "Zulu".

 

The name of GMT was changed to Universal Time Coordinated as a compromise between English (Coordinated Universal Time -CUT) and French language (Temps Universel Coordonne -TUC). Formally adopted in 1967, but fully implemented quite a bit later.

 

UTC is kept within .9 seconds of International Atomic Time (TAI).

 

All zone times are referenced from UTC/GMT. In WWII, Britain was on either British Summer Time (GMT+1) or Double British Summer Time (GMT+2). The invasion was planned in Double British Summer Time or Zone B.

 

The chart below is the one found in Bowditch's Practical Navigator, the apparent origin of the alphabetical zone system.

 

The numbers above the Zone letter are the correction to apply to get UTC.

 

Bowditch-time-zone.jpg

 

For a PDF access to Bowditch and a bunch of other celestial navigation stuff go to The Nautical Almanac


Edited by pmiceli

 

 

 

 

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