The experimental devices used to measure the angle of the sun are analysed and the results compared to the theorical values. They are classified, and evaluated. The issues are identified, and solutions are proposed to improve the measures
Gnomon of about 1m, fixed on a base, laid on the ground Gnomon of about 1m, fixed the side of the base Gnomon of about 1m, with spirit level or triangle Gnomon : About 1 meter plumb line Gnomon of about 1m, held with hand Large base and thin top gnomon Gnomon of about 1m, planted in the ground Small height gnomon Direct measure of the angle with a protractor Gnomon with stable and wide base Gnomon fixed on a board Spirit level used as gnomon Ready made gnomon Lego gnomon Artistic gnomon
Gnomon of about 1m, fixed on a base, laid on the ground Verticality C
Origin of shadow C
Precision CC
Kuantan MALAYSIA
Rionegro COLOMBIA
Ioannina GREECE
Medellin COLOMBIA
Gnomon of about 1m, fixed the side of the base Verticality C
Origin of shadow CC
Precision CC
Kuantan MALAYSIA
Donji Muc CROATIA
Gnomon of about 1m, with spirit level or triangle Verticality CC
Origin of shadow CC
Piraeus GREECE
Andritsaina GREECE
Precision CC
Tauragé LITHUANIA
Pogana ROMANIA
Gnomon : About 1 meter plumb line Verticality CC
Origin of shadow CC
Ubeda SPAIN
Quy Nhon VIETNAM
Ubeda SPAIN
Precision CC
Gnomon of about 1m, held with hand Verticality Margineni ROMANIA
Origin of shadow C
Precision CC
Rio de Janeiro BRAZIL
Large base and thin top gnomon Verticality C
Origin of shadow
Pylos GREECE
New Delhi INDIA
Precision C
Busteni ROMANIA
Gnomon of about 1m, planted in the ground Verticality ď „
Origin of shadow C
Dholpur INDIA
Guarne COLOMBIA
Precision CC
Bizerte TUNISIA
Small height gnomon Verticality C
Origin of shadow CC
Precision ď „
Bayamon PUERTO RICO
Hyderabad INDIA
Busteni ROMANIA
Direct measure of the angle with a protractor Verticality C
Origin of shadow C
Precision
Calculation with tan-1= shadow/gnomon : +/- 0,1° Measure with protractor : +/- 0,5°
Athens GREECE
Margineni ROMANIA
Guarne COLOMBIA
Piraeus GREECE
Ioannina GREECE
Gnomon with stable and wide base Verticality CC
Origin of shadow CC
Precision CC
Petroupoli GREECE
Bizerte TUNISIA
Hô ChiMinh City VIETNAM
Ioannina GREECE
Rm Valcea ROMANIA
Alta Gracia ARGENTINA
Gnomon fixed on a board Verticality CC
Origin of shadow CC
Precision CC
Piranguinho BRAZIL
Rio Cuarto ARGENTINA
Itajuba BRAZIL
Rio de Janeiro BRAZIL
Spirit level used as gnomon Verticality CC
Origin of shadow CC
Precision CC
Ilion GREECE
Ilion GREECE
Andritsaina GREECE
Aigio GREECE
Ready made gnomon Verticality CC
Origin of shadow CC
Precision CC
Dholpur INDIA
Chivilcoy ARGENTINA Athens GREECE
Cernay FRANCE
Lego gnomon Verticality CC
Origin of shadow CC
Precision CC
Villa Del Prado ARGENTINA
Villa Del Prado ARGENTINA Villa Del Prado ARGENTINA
Pergamino ARGENTINA
Artistic gnomon Verticality C
Origin of shadow C
Precision ď „