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Dear Dave,

Regarding your final estimate at Ege University Observatory Izmir - i.e. at N38°23'/E027°16' as per Wiki - I am getting a Sun upper limb at the Horizon at UT = 03h21m30s.

From earlier data given by Frank, and therefore assuming that the picture was taken exactly 46 minutes earlier, its clocks the photo at a time very close from 02h36m UT on Apr 25, 2025.

Through reverse engineering, get for 02h36 m :

Sun Center height : -9.1° (i.e. below the horizon), Saturn 7.178/99.4 and Venus 10.772/9.76

Even assuming that cosine of  Venus height - i.e. cos 10.772° - exactly equals 1.00000.., which brings a systematic error of about to 1° in its direction seen from Saturn, I am deriving SV  = 332.1° (vs. 327° from the photo) and SM = 316.7° (vs. 321°) with a difference in directions equal to 15.4° (vs. 6°).

That's definitely a no-match here.

Possible reasons for that :

- Gross errors in my own computations, which I am to verify carefully. If I did err in my computations, I am to amend them then, while still retaining the unchanged SM / SV method earlier described. I certainly need to check whether this approach is both useful and efficient here to solve this specific problem.

- Error in your own determination. At a first step, see (1) here-after.

So, pending such further checks from both of us :

(1) - How do "Stellarium" (or the like) pictures seen from Izmir compare with Cairo ?

While I am not using any such Software, anybody using the right kind of Software can reply here.

(2) - For Frank :

(2.1) - What is your own result, i.e. place and UT ?

(2.2) - How did you derive it ? Your method seems to take advantage of the Moon horns orientation, which I am not relying on at all. I am looking forward and willing to learn from your knowledge here.

(2.3) - Thanks in advance to you Frank, and thanks anyway for this interesting problem.

Kermit

antoine.m.couette[at]club-internet.fr