@testset "obl06" begin
    obl = obl06(2400000.5, 54388.0)
    @test obl ≈ 0.4090749229387258204 atol=1e-16
end

@testset "obl80" begin
    obl = obl80(2400000.5, 54388.0)
    @test obl ≈ 0.409075134764381621 atol=1e-16
end

