To aid you in planning your observations the table below shows the following times for Kenley Observatory, Surrey.

Nautical Twilight is when the Horizon is still visible to allow Sextant readings of the altitude of stars to be taken.

Astronomical Twilight is when the Sun is sufficiently below the Horizon for astronomical observations.

Times are in UTC – add one hour to the times given for Summer Time.

The table is available in in PDF format, this allows you to print out the pages that you are interested in. It is bookmarked every month to enable you to jump quickly to the month you are interested in. It is also available as an Excel file if you wish to extract parts.

Hope you find it useful – Good Observing

If you wish the times for a different location / altitude they can be found using the Calendar Option in Cartes du Ciel (external link).