Use datas em cálculos astronômicos 

Encontre as posições do Sol e da Lua na localização onde você estiver.

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X SunPosition[Here, Now]

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In[2]:=

X MoonPosition[Here, Now]

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Projete graficamente as posições do Sol e da Lua na esfera celeste.

In[3]:=

X EquatorialtoCartesian[ ra_, dec_] := { Cos[ra 15 \[Degree]] Sin[(dec + 90) \[Degree]], Sin[ra 15 \[Degree]] Sin[(dec + 90) \[Degree]], -Cos[(dec + 90) \[Degree]] }

In[4]:=

X Show[ ParametricPlot3D[{Cos[t] Sin[p], Sin[t] Sin[p], Cos[p]}, {t, 0, 2 Pi}, {p, 0, Pi}, PlotStyle -> {White, Opacity[.2]}, MeshStyle -> Black, Boxed -> False, Axes -> None, Background -> Black, Lighting -> "Neutral"], Graphics3D[{ Yellow, Sphere[EquatorialtoCartesian @@ QuantityMagnitude@ SunPosition[DateObject[Today], CelestialSystem -> "Equatorial"], .1], Gray, Sphere[ EquatorialtoCartesian @@ QuantityMagnitude@ MoonPosition[DateObject[Today], CelestialSystem -> "Equatorial"], .1]}], SphericalRegion -> True]

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