Le vendredi 27 décembre 2019 07:46:08 UTC+1, Surge a écritÂ*:
On Thursday, 26 December 2019 19:22:36 UTC+2, wrote:
Intrigued by this post, I went searching for the SA AIP (http://www.caa..co.za/Pages/Aeronaut...blication.aspx) to check what is called "day" in the local AIP. Although I found about 190 occurences of the words "day" or "daytime" in the GEN and ENR parts, I was unable to find a valid definition of these terms.

The SA AIP gives SR and SS tables for different Airports, but not for Douglas.

In my country, "day" is clearly defined in the AIP as SR-30' SS+30'; I know of other countries where it is between civil twilights. Where did you get the SR-15' SR+15' from?

"Day" is defined by the South African CAA as "The period of time from fifteen minutes before sunrise to fifteen minutes after sunset."

Source:
http://www.caa.co.za/Standards%20and...brevations.pdf

Thanks for the source.