how can i verify the destination point is right?

[linxiaowu66]

Hi,
I use this repo to calculate the destination point, the process as follow:

const distance = new LatLon(122.028758, 29.789461)
        .distanceTo(new LatLon(122.011392, 29.7752625))
        .toFixed()  // >> print the 2105 m, this is right

// then i cal the initialBearing

const bearing = new LatLon(122.028758, 29.789461)
        .initialBearingTo(new LatLon(122.011392, 29.7752625))
        .toFixed(1) // >> it print the 336.6 degree, but i can not verify it

// than i use the destination method to prove the above two method result is right ?

const destPoint = new LatLon(122.028758, 29.789461)
        .destinationPoint(distance, bearing)
        .toString() 

// it print the '57.9713°N, 029.7895°E', but this result it not equal the `122.011392, 29.7752625`

so something i went wrong ?

[chrisveness]

Sorry not to have replied to this in so long.

A latitude of 122.029° has gone over the north pole and headed back down the other side, travelling 122.029-90 = 32.029° south from the north pole, that is latitude 57.971°N.

This could be rejected as an error, but sometimes it can come out as a valid result of calculations, so e.g. 110°N is considered equivalent to 70°N.