Class: Astronoby::Aberration
- Inherits:
-
Object
- Object
- Astronoby::Aberration
- Defined in:
- lib/astronoby/aberration.rb
Class Method Summary collapse
Instance Method Summary collapse
-
#apply ⇒ Object
Source: Title: Practical Astronomy with your Calculator or Spreadsheet Authors: Peter Duffett-Smith and Jonathan Zwart Edition: Cambridge University Press Chapter: 36 - Aberration.
-
#initialize(coordinates, epoch) ⇒ Aberration
constructor
A new instance of Aberration.
- #sun_longitude ⇒ Object
Constructor Details
#initialize(coordinates, epoch) ⇒ Aberration
Returns a new instance of Aberration.
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# File 'lib/astronoby/aberration.rb', line 9 def initialize(coordinates, epoch) @coordinates = coordinates @epoch = epoch end |
Class Method Details
.for_ecliptic_coordinates(coordinates:, epoch:) ⇒ Object
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# File 'lib/astronoby/aberration.rb', line 5 def self.for_ecliptic_coordinates(coordinates:, epoch:) new(coordinates, epoch).apply end |
Instance Method Details
#apply ⇒ Object
Source:
Title: Practical Astronomy with your Calculator or Spreadsheet
Authors: Peter Duffett-Smith and Jonathan Zwart
Edition: Cambridge University Press
Chapter: 36 - Aberration
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# File 'lib/astronoby/aberration.rb', line 19 def apply delta_longitude = Angle.as_degrees( -20.5 * ( sun_longitude - @coordinates.longitude ).cos / @coordinates.latitude.cos / 3600 ) delta_latitude = Angle.as_degrees( -20.5 * (sun_longitude - @coordinates.longitude).sin * @coordinates.latitude.sin / 3600 ) Coordinates::Ecliptic.new( latitude: @coordinates.latitude + delta_latitude, longitude: @coordinates.longitude + delta_longitude ) end |
#sun_longitude ⇒ Object
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# File 'lib/astronoby/aberration.rb', line 38 def sun_longitude @_sun_longitude ||= Sun.new(epoch: @epoch).ecliptic_coordinates.longitude end |