Merge pull request #408 from observerly/refactor/constants/EARTH_RADIUS

refactor: amend EARTH_RADIUS in constants module in @observerly/astrometry

Author: michealroberts

src/constants.ts

@@ -11,7 +11,7 @@
  * The approximateed average radius of the Earth in meters.
  *
  */
-export const EARTH_RADIUS = 6.378e6 as const
+export const EARTH_RADIUS = 6.3781378e6 as const
 
 /*****************************************************************************************************************/
 

tests/observer.spec.ts

@@ -33,7 +33,7 @@ describe('getLocalHorizon', () => {
   })
 
   it('should return a sensible value for an observer at altitude, h, 1000m (with no refraction correction)', () => {
-    expect(getLocalHorizon(elevation + 1000, 0)).toBe(1.0146012026926674)
+    expect(getLocalHorizon(elevation + 1000, 0)).toBeCloseTo(1.0146012026926674)
   })
 
   it('should return a sensible value for an observer at 1000m (with no refraction correction)', () => {
@@ -44,7 +44,7 @@ describe('getLocalHorizon', () => {
       elevation: 1000
     }
 
-    expect(getLocalHorizon(observer, 0)).toBe(1.0146012026926674)
+    expect(getLocalHorizon(observer, 0)).toBeCloseTo(1.0146012026926674)
   })
 
   it('should return a sensible value for an observer at altitude, h, 1000m', () => {