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Planetario con coordinate |
Planetarium with coordinates |
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Nel planetario puoi leggere le coordinate equatoriali ascensione retta (in blu) e la declinazione (in rosso) dei singoli astri.
Come puoi notare l'ascensione retta è espressa in ore con la convenzione che 360° corrispondono a 24 ore. (1 ora = 360°/24=15°)
Se
vuoi avere in locale il planetario devi scaricare il file
planetario_bianco.tif
da 1.4MB
Qui
puoi scaricare
FSPViewer, ottimo programma free che |
On the planetarium above, an equatorial grid is also applied, by which you can determine approximated coordinates (right ascension through blue figures, declination through red ones) of the reported stars. You can notice that the right ascension (RA) is reported in hours (and minutes and seconds), right like a time measurement. Practically, we must just keep into account that a full turn is 360° equiv. to 24h. However, measuring that angle by time dimensions instead of usual degrees states the particular concept of this kind of celestial coordinates, which are practically independent from time and location over the Earth.
If you wish to use the planetarium in off-line mode, then download the file planetario_bianco.tif (1.4 MB). Since such a bitmap file represents all the celestial sphere by an equi-rectangular cylindrical projection, to enjoy a suitable view you’ll need a special viewer. Here you can download the efficient and free FSPViewer software, which does not even need installation (just drag the TIF file on the EXE). |
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La figura precedente rappresenta un planetario in
formato "cubico" che vuole essere solo un giocattolo ma che comunque può
aiutarci a prendere confidenza con le coordinate celesti e con il
posizionamento reciproco tra le costellazioni più famose. Puoi scaricare
il file |
Above is represented a cube format planetarium. It’s just little more than a toy, nevertheless it helps to get acquaintance with celestial coordinates and location of major constellations. You can download the ready-to-be-printed
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