Progettazione e Realizzazione di Orologi Solari


Strumenti

L’Equazione del Tempo

Nella seguente tabella ciascun valore quotidiano dell’equazione del tempo è il risultato della media aritmetica dei veri valori calcolati in un periodo di 400 anni, dal 2001 al 2400 (durata media anno: 365.2425d), riferiti alle 11:00 TU di ogni giorno.

I valori dell’equazione vengono espressi sia nel formato minuti-secondi sia in quello minuti.decimali.

La scelta di considerare il periodo di 400 anni, anziché di 10, 20 o 100 ecc. non è certo casuale: com’è noto 400 sono gli anni dopo i quali si ripete il ciclo alla base dell’attuale calendario gregoriano, che con 365.2425d di media all’anno si tiene al passo con l’anno tropico (365.2422d) in maniera tutto sommato ragionevolmente semplice e precisa.

La scelta di riferire il periodo agli anni 2001-2400, invece, deriva unicamente dal trovarci attualmente in quest’epoca, con lo sguardo al futuro…

Valori quotidiani dell’Equazione del Tempo
calcolati nell’anno medio (periodo 2001-2400)
GENFEBMARAPRMAGGIULUGAGOSETOTTNOVDIC
1+2m58s
+2.97m
+13m06s
+13.10m
+12m03s
+12.05m
+3m49s
+3.81m
−2m45s
−2.74m
−1m49s
−1.82m
+4m18s
+4.30m
+6m43s
+6.72m
+0m15s
+0.25m
−10m15s
−10.25m
−16m32s
−16.54m
−11m20s
−11.33m
2+3m26s
+3.44m
+13m14s
+13.24m
+11m52s
+11.86m
+3m32s
+3.53m
−2m51s
−2.85m
−1m39s
−1.65m
+4m29s
+4.49m
+6m39s
+6.64m
−0m05s
−0.08m
−10m35s
−10.58m
−16m34s
−16.56m
−10m57s
−10.95m
3+3m54s
+3.90m
+13m21s
+13.36m
+11m40s
+11.66m
+3m14s
+3.24m
−2m57s
−2.95m
−1m29s
−1.49m
+4m41s
+4.68m
+6m34s
+6.56m
−0m24s
−0.41m
−10m54s
−10.90m
−16m34s
−16.57m
−10m34s
−10.57m
4+4m22s
+4.36m
+13m28s
+13.46m
+11m27s
+11.45m
+2m57s
+2.96m
−3m02s
−3.04m
−1m19s
−1.31m
+4m51s
+4.86m
+6m28s
+6.47m
−0m44s
−0.74m
−11m13s
−11.22m
−16m34s
−16.57m
−10m11s
−10.18m
5+4m48s
+4.81m
+13m33s
+13.55m
+11m14s
+11.24m
+2m41s
+2.68m
−3m07s
−3.12m
−1m08s
−1.13m
+5m02s
+5.03m
+6m22s
+6.37m
−1m05s
−1.08m
−11m31s
−11.52m
−16m33s
−16.56m
−9m46s
−9.77m
6+5m15s
+5.25m
+13m38s
+13.63m
+11m01s
+11.01m
+2m24s
+2.40m
−3m11s
−3.19m
−0m57s
−0.95m
+5m12s
+5.20m
+6m15s
+6.26m
−1m25s
−1.42m
−11m50s
−11.83m
−16m32s
−16.53m
−9m22s
−9.36m
7+5m41s
+5.69m
+13m42s
+13.70m
+10m47s
+10.78m
+2m07s
+2.12m
−3m15s
−3.25m
−0m46s
−0.76m
+5m22s
+5.36m
+6m08s
+6.13m
−1m46s
−1.77m
−12m07s
−12.12m
−16m29s
−16.49m
−8m56s
−8.94m
8+6m07s
+6.11m
+13m45s
+13.75m
+10m33s
+10.55m
+1m51s
+1.85m
−3m18s
−3.30m
−0m34s
−0.56m
+5m31s
+5.52m
+6m00s
+6.00m
−2m07s
−2.11m
−12m25s
−12.41m
−16m26s
−16.43m
−8m31s
−8.51m
9+6m32s
+6.53m
+13m47s
+13.79m
+10m18s
+10.31m
+1m35s
+1.59m
−3m21s
−3.34m
−0m22s
−0.37m
+5m40s
+5.67m
+5m52s
+5.86m
−2m28s
−2.47m
−12m42s
−12.70m
−16m22s
−16.36m
−8m04s
−8.07m
10+6m56s
+6.94m
+13m49s
+13.82m
+10m03s
+10.06m
+1m19s
+1.32m
−3m23s
−3.38m
−0m10s
−0.16m
+5m49s
+5.81m
+5m43s
+5.71m
−2m49s
−2.82m
−12m58s
−12.97m
−16m16s
−16.27m
−7m38s
−7.63m
11+7m21s
+7.34m
+13m50s
+13.83m
+9m48s
+9.80m
+1m04s
+1.07m
−3m24s
−3.40m
+0m02s
+0.04m
+5m57s
+5.94m
+5m33s
+5.55m
−3m11s
−3.18m
−13m14s
−13.24m
−16m10s
−16.17m
−7m11s
−7.18m
12+7m44s
+7.73m
+13m50s
+13.83m
+9m33s
+9.55m
+0m49s
+0.81m
−3m25s
−3.41m
+0m15s
+0.25m
+6m04s
+6.07m
+5m23s
+5.38m
−3m32s
−3.53m
−13m30s
−13.50m
−16m04s
−16.06m
−6m43s
−6.72m
13+8m07s
+8.11m
+13m49s
+13.82m
+9m17s
+9.28m
+0m34s
+0.56m
−3m25s
−3.42m
+0m28s
+0.46m
+6m11s
+6.19m
+5m12s
+5.20m
−3m54s
−3.89m
−13m45s
−13.75m
−15m56s
−15.93m
−6m15s
−6.25m
14+8m29s
+8.48m
+13m48s
+13.79m
+9m01s
+9.01m
+0m19s
+0.32m
−3m25s
−3.41m
+0m41s
+0.68m
+6m18s
+6.30m
+5m00s
+5.01m
−4m15s
−4.25m
−13m59s
−13.99m
−15m48s
−15.79m
−5m47s
−5.78m
15+8m51s
+8.84m
+13m46s
+13.76m
+8m45s
+8.74m
+0m05s
+0.09m
−3m24s
−3.40m
+0m53s
+0.89m
+6m24s
+6.40m
+4m49s
+4.81m
−4m37s
−4.62m
−14m13s
−14.22m
−15m38s
−15.64m
−5m19s
−5.31m
16+9m12s
+9.19m
+13m43s
+13.71m
+8m28s
+8.47m
−0m09s
−0.14m
−3m22s
−3.37m
+1m07s
+1.11m
+6m30s
+6.50m
+4m36s
+4.60m
−4m59s
−4.98m
−14m27s
−14.45m
−15m28s
−15.47m
−4m50s
−4.83m
17+9m32s
+9.53m
+13m39s
+13.65m
+8m11s
+8.19m
−0m22s
−0.37m
−3m20s
−3.34m
+1m20s
+1.33m
+6m35s
+6.58m
+4m23s
+4.39m
−5m20s
−5.34m
−14m40s
−14.66m
−15m17s
−15.28m
−4m21s
−4.35m
18+9m51s
+9.86m
+13m35s
+13.58m
+7m54s
+7.90m
−0m35s
−0.59m
−3m18s
−3.30m
+1m33s
+1.55m
+6m40s
+6.66m
+4m10s
+4.16m
−5m42s
−5.70m
−14m52s
−14.86m
−15m05s
−15.09m
−3m52s
−3.86m
19+10m10s
+10.17m
+13m30s
+13.50m
+7m37s
+7.62m
−0m48s
−0.80m
−3m15s
−3.25m
+1m46s
+1.77m
+6m44s
+6.73m
+3m56s
+3.93m
−6m04s
−6.07m
−15m03s
−15.06m
−14m53s
−14.88m
−3m22s
−3.37m
20+10m29s
+10.48m
+13m24s
+13.40m
+7m20s
+7.33m
−1m00s
−1.00m
−3m11s
−3.19m
+1m59s
+1.99m
+6m47s
+6.79m
+3m41s
+3.69m
−6m26s
−6.43m
−15m14s
−15.24m
−14m39s
−14.65m
−2m53s
−2.88m
21+10m46s
+10.77m
+13m18s
+13.30m
+7m03s
+7.04m
−1m12s
−1.20m
−3m07s
−3.12m
+2m12s
+2.21m
+6m50s
+6.83m
+3m26s
+3.44m
−6m47s
−6.79m
−15m25s
−15.41m
−14m25s
−14.41m
−2m23s
−2.39m
22+11m03s
+11.04m
+13m11s
+13.18m
+6m45s
+6.75m
−1m23s
−1.39m
−3m02s
−3.04m
+2m26s
+2.43m
+6m52s
+6.87m
+3m11s
+3.18m
−7m09s
−7.15m
−15m35s
−15.58m
−14m10s
−14.16m
−1m54s
−1.90m
23+11m18s
+11.31m
+13m03s
+13.06m
+6m27s
+6.46m
−1m34s
−1.57m
−2m57s
−2.95m
+2m39s
+2.64m
+6m54s
+6.90m
+2m55s
+2.92m
−7m30s
−7.50m
−15m44s
−15.73m
−13m54s
−13.90m
−1m24s
−1.40m
24+11m34s
+11.56m
+12m55s
+12.92m
+6m10s
+6.16m
−1m45s
−1.75m
−2m51s
−2.86m
+2m52s
+2.86m
+6m55s
+6.92m
+2m39s
+2.65m
−7m51s
−7.86m
−15m52s
−15.87m
−13m37s
−13.62m
−0m55s
−0.91m
25+11m48s
+11.80m
+12m47s
+12.78m
+5m52s
+5.87m
−1m55s
−1.92m
−2m45s
−2.75m
+3m04s
+3.07m
+6m56s
+6.93m
+2m22s
+2.37m
−8m13s
−8.21m
−16m00s
−15.99m
−13m20s
−13.33m
−0m25s
−0.42m
26+12m02s
+12.03m
+12m37s
+12.62m
+5m34s
+5.57m
−2m04s
−2.07m
−2m39s
−2.64m
+3m17s
+3.29m
+6m56s
+6.93m
+2m05s
+2.09m
−8m34s
−8.56m
−16m06s
−16.11m
−13m01s
−13.02m
+0m05s
+0.08m
27+12m14s
+12.24m
+12m27s
+12.46m
+5m17s
+5.28m
−2m13s
−2.22m
−2m31s
−2.52m
+3m30s
+3.50m
+6m55s
+6.92m
+1m48s
+1.80m
−8m54s
−8.91m
−16m13s
−16.21m
−12m42s
−12.71m
+0m34s
+0.57m
28+12m26s
+12.44m
+12m17s
+12.28m
+4m59s
+4.98m
−2m22s
−2.37m
−2m24s
−2.40m
+3m42s
+3.70m
+6m54s
+6.90m
+1m30s
+1.50m
−9m15s
−9.25m
−16m18s
−16.30m
−12m23s
−12.38m
+1m03s
+1.05m
29+12m38s
+12.63m
+12m06s
+12.10m
+4m41s
+4.69m
−2m30s
−2.50m
−2m16s
−2.26m
+3m54s
+3.91m
+6m52s
+6.87m
+1m12s
+1.19m
−9m35s
−9.59m
−16m23s
−16.38m
−12m02s
−12.04m
+1m32s
+1.54m
30+12m48s
+12.80m
 +4m24s
+4.40m
−2m38s
−2.63m
−2m07s
−2.12m
+4m06s
+4.10m
+6m50s
+6.83m
+0m53s
+0.88m
−9m55s
−9.92m
−16m27s
−16.44m
−11m41s
−11.69m
+2m01s
+2.02m
31+12m57s
+12.96m
 +4m06s
+4.11m
 −1m58s
−1.97m
 +6m47s
+6.78m
+0m34s
+0.57m
 −16m30s
−16.50m
 +2m30s
+2.50m
GENFEBMARAPRMAGGIULUGAGOSETOTTNOVDIC