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Observations of Sun light inside Treasury of Atreus

Use a good clock

When doing these observations it is important to have the time as accurate as possible, so try to synchronize your clock (watch/mobile/camera) with an accurate time source; like the time-peeps on the radio/TV or some other accurate source (e.g. GPS or Internet Time source). This link provides the GTM time (same as UTC), which is three hours less then Greek local summer time [UTC+3].
Write in the below table the date and time and the amount of change made, when you adjust the time on your clock. Do this at least once; before your start with your very first observation.
I would propose to check it every 5 days. If you think your clock is changing very fast, say more then a few minutes in 7 days; do this synchronization every 2 days; or better use another clock;-)

Below is a table that can be printed and used as a log sheet for the time synchronization:

Date of synchronization [yyyy/mm/dd]	New time [hh:mm:ss]	Change made [sec]	Source [radio/TV/GPS/Internet]
2007/08/29
2007/09/03
2007/09/08
2007/09/13
2007/09/18
2007/09/23
2007/09/28
2007/10/03

Finding the first day the Sun gets throught the triangular structure

When starting to observe a solar event in a monument, the first moment that the Sun gets into the chamber is always difficult to predict accurately from a model (due to possible inaccuracies when modeling the triangular structure). So one has to start looking from a certain date (I propose August 30^th, 2007) from around 08:00 local time [UTC+3]. Due to these geometrical unknowns of the relieving triangular structure, one needs to keep on looking until 9:15 local time [UTC+3].
Hopefully in this time period (between 08:00 and 09:15) the Sun light peeps in the chamber. If not; one has to repeat this procedure each day, until the Sun light gets in the chamber. At that moment one has a better idea when it starts and ends.
It is best to repeat the same time period (between 08:00 and 09:15) for the next two days, because the start time might be much earlier then in the rest of the month (when 5 minutes is oke).

Make sure (look outside the chamber) that when the Sun light starts to get in the chamber, it is not because clouds just went out of the way of the Sun. Comparable with last Sun light; make sure (look outside the chamber) that the Sun light did not stop due to clouds in front of the Sun.

As soon as one has had a good three observation days, one can easily 'predict' the time for the next day; be there 5 minutes earlier then the start time on the previous day. In that case one certainly does not miss the start of the event. The end time is simple, just wait until the Sun light is gone from the chamber (check that it is not due to clouds).

The observations

Below is a table that can be printed and used as a log sheet for the observations. The green dates are the predicted dates (Sept. 1^st upto and including Sept 28^th, 2007) that the sun could be in the chamber, but again be prepared to be there a few days earlier (proposed Aug. 30^th, 2007) and a few days later (until totally no Sun is visible anymore in the chamber):

Date [yyyy/mm/dd]	First time Sun in chamber [hh:mm:ss] using local time	Clouds before? [yes/no]	Last time Sun in chamber [hh:mm:ss] using local time	Clouds after? [yes/no]	Picture number+ time [hh:mm:ss]
2007/08/30
2007/08/31
2007/09/01
2007/09/02
2007/09/03
2007/09/04
2007/09/05
2007/09/06
2007/09/07
2007/09/08
2007/09/09
2007/09/10
2007/09/11
2007/09/12
2007/09/13
2007/09/14
2007/09/15
2007/09/16
2007/09/17
2007/09/18
2007/09/19
2007/09/20
2007/09/21
2007/09/22
2007/09/23
2007/09/24
2007/09/25
2007/09/26
2007/09/27
2007/09/28
2007/09/29
2007/09/30
2007/10/01
2007/10/02					version 0.1

Making pictures

If you make pictures, please note also the time (as shown by the same clock you used for the observations). Put this information also in the above table (last column).

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Major content related changes: April 25th, 2007