Beograd, 2021

Beograd (Hadži-Prodanova, 5), 14th Belgrade Gymnasium

(Designed by professor Ratomir Veselinović with his students; calculation by M. Tadić)

(44° 48′ 12″ N,  20° 28′ 31″ E)

Figure 1. Installation of the sundial. The contents of the sundial are printed on a forex board (140 x 100 x 1 cm).

Figure 2. The end of the shadow moved in hyperbole for the summer solstice and silently announced the astronomical beginning of summer.

Figure 3. Info-board showing “what’s what” on the sundial. The bar code allows students to get additional explanations on their mobile phone.