Travnik – medieval fortress Stari grad, 2023

Calculation and design: Milutin Tadić

Making: Esad Vesković & Emir Kapetanović

44° 13′ 48″ N, 17° 40′ 15″ E, A = 75,5°

Figure 1. What’s what on the sundial. Alla Turca sundial: (1) shadow thrower (orthognomon); (2) hour lines; (3) alla Turca dial; (4) projection of the arc of the South Celestial Tropic; (5) projection of the arch of the celestial equator; (6) projection of the arc of the North Celestial Tropic ; (7) qibla vertical line; (8) meridian line, also the line of the Zuhr; (9) line of the Asr. Alla Franga sundial: (10) shadow thrower (polos); (11) hour lines; (12) alla Franga dial; (13) analemma; (14) geographical coordinates, altitude, geographical azimuth of the wall, and the year of installation. (The numbers (4), (5) and (6) have the same meanings as on the alla Turca sundial.)
Figure 2. Aerial view and orthophoto of the medieval fortress Stari grad. The location of the sundial is indicated by red arrows.
Figure 3. The contents of the sundial are engraved in a stone slab (bihacite) measuring 120 x 100 x 3 cm, which is placed against the wall of the old Powder magazine that has been converted into an exhibition space..
Figure 4. The old Powder magazine can only be reached on foot, so the plate weighing about 300 kg was carried 120 meters uphill only on hands.
Figure 5. Lifting the sundial onto a metal stand in the presence of Sabina Maslić, the architect of the Regional Museum of Travnik, who constructed that stand.
Figure 6. With the help of a mechanical wheel, the plate was put on the stand by Ajdin Kasumović and his workers; the sundial was carved by Esad Vesković and Emir Kapetanović, while the lines were painted by Emir Mutevelić.
Figure 7. The sundial was installed on March 18 when the sun had already set, so that the sun shone on it for the first time only the next day. The photo shows the moment of the trial “commissioning” of the sundial. Then all that was left was to repair minor damage to the board and renew the paint (photo: Mirsad Mujanović).
Figure 8. The sundial passed the check that was “commissioned” on March 19 (e = -8 min): the tip of the shadow of the orthognomon fell on the qibla line at 9 h 34 min (Sun towards qibla), on the line for the fifth alla Turca hour at 10 h 54 min, and on the March arc of the analemma exactly at 12 CET. (Note. The first two photos were taken before the color was restored.)
Figure 9. On the first day of spring, March 21 [d = 0°, e = – (7 min 15 s)], the tips of the shadows of both pointers should follow the projection of the celestial equator. The day was overcast, and the sun peeked out from behind the clouds only for a short time before noon. In one of the rare images, taken at 9:07 a.m. CET, it is nice to see that the ends of the shadows of both pointers fall on the projections of the celestial equator.
Figure 10. In front of the sundial with Mrs. Fatima Maslić, director of the Regional Museum of Travnik. The fact that Travnik got a “double” sundial is primarily on her merit (photo: Mirsad Mujanović).
Fig. 11. Tourists must stop in front of the sundial under which concise explanations are placed (photo: Fatima Maslić).
Fig. 12. Check, summer solstice 2023: the shadow moved “on schedule”.