Wolfram言語™

混合数量

混合数量は，金銭，時間，距離，重さ，角度等，多数のコンテキストに見られる．

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Quantity[MixedMagnitude[{2, 35, 21.2}], MixedUnit[{"Hours", "Minutes", "Seconds"}]]

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In[2]:=

UnitConvert[Quantity[75.562, "AngularDegrees"], MixedUnit[{"AngularDegrees", "ArcMinutes", "ArcSeconds"}]]

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Quantity[MixedMagnitude[{5, 11}], MixedUnit[{"Feet", "Inches"}]]

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Quantity[MixedMagnitude[{5, 11}], MixedUnit[{"Feet", "Inches"}]]; % + Quantity[2.5, "Feet"]

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関数SiderealTimeは混合数量を返す．ユーザの現在位置における恒星時を求める．

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stime = SiderealTime[]

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太陽の現在位置を赤道座標系で求める．

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sunpos = SunPosition[CelestialSystem -> "Equatorial"]

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月の位置を同じ座標系で計算する．

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moonpos = MoonPosition[CelestialSystem -> "Equatorial"]

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惑星の赤経座標を求める．

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planetpos = QuantityMagnitude[ DeleteMissing[ EntityValue[EntityClass["Planet", All], EntityProperty["Planet", "RightAscension"]]], "HoursOfRightAscension"]

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さまざまな位置の測度値を組み合せ，各天体の赤経のリストを作る．

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ascensions = Join[ {0, moonpos[[1, 1]] - sunpos[[1, 1]]}, planetpos];

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gp = Sequence[GeoRange -> "World", GeoProjection -> {"AzimuthalEquidistant", "Centering" -> {-90, 0}}]; globe = GeoGraphics[{Thick, Black, Arrow[{{0, 0}, $GeoLocation}]}, gp, GeoBackground -> GeoStyling["ReliefMap"]][[1, 1]]; cross = {Thickness[.005], Opacity[.5], Line[9.5 {-#, #}]} & /@ {{0, 1}, {1, 0}}; shade = GeoGraphics[{Opacity[.5], GeoDisk[{-sunpos[[2, 1]], 180}, 10018758]}, gp, GeoBackground -> None][[1, 1]];

南極から見た惑星，太陽，月の位置のグラフィックビューを作る．

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Rasterize[ Graphics[{globe, cross, shade, MapThread[ Text[Style[#3, #2, 24, FontWeight -> Bold], {0, 3.5}.RotationMatrix[(#1) \[Pi]/12]] &, {ascensions, {Yellow, White, Orange, Lighter[Blue], Red, Lighter[Purple], Orange, Cyan, Lighter[Blue]}, {"☼", "\[Moon]", "\[Mercury]", "\[Venus]", "\[Mars]", "\[Jupiter]", "\[Saturn]", "♅", "\[Neptune]"}}]}, Background -> GrayLevel[0.2], PlotRange -> 4, PlotLabel -> #, LabelStyle -> {Bold, White}, Axes -> None] &@stime, RasterSize -> 600, ImageSize -> 450]

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