Yesterday, on October 16, 2015, the upper culmination of the Sun at the venue of the Olympiad was at 11:29:44 local time. Calculate as accurate as possible at what time the upper culmination of the Sun will be (or was) today.

Information given: Location: Kazan, Tatarstan, Russia 55°48’N 49°06’ E UT+3 A very rough Equation of Time is given, but the difference is indiscernible between two weeks (much less two days), thus we can only infer from this graph that mid-October gives a 15 minutes offset.

This is the first question of the International Astronomy Olympiad 2015 Theoretical Round

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    $\begingroup$ What's important here isn't the value, but rather the slope (of the equation of time) $\endgroup$ – barrycarter Sep 23 at 16:55

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