Hello Arctic

Basics

Considering oblate spheroid earth, the geodetic distance between two points with specific angular separation, gets longer as closer to the Arctic.

Intel map use spherical earth model, distance calculator is as simple as Haversine formula:

a = sin²(Δφ/2) + cos φ1 ⋅ cos φ2 ⋅ sin²(Δλ/2)

c = 2 ⋅ atan2( √a, √(1−a) )

d = R ⋅ c

Where typical a is the mean value of equatorial radius and polar radius, 6367.44465km.

Simply, we use Haversine formula with a = 6367.000 km, comparing with the last column using WGS-84 ellipsoid (calculated by https://www.fai.org/page/world-distance-calculator).

Link Plan

Anchor point Qaanaaq City (77.485419, -69.375107)

End point Dunhuang

1. 功勋飞机——米格-15 (40.506115,95.781636) 6850.9894 km 6873.9339 km
2. 锁阳城遗址 (40.270107,96.198539) 6879.3576 km 6902.2922 km
3. 锁阳城堡子 (40.252548,96.193275) 6881.2779 km 6904.2109 km
4. 悬泉置遗址 (40.269237,95.330322) 6874.8158 km 6897.7298 km
5. 河州堡遗址 (40.173982,94.601196) 6881.2757 km 6904.1631 km

End point Beijing

1. 采荷沙弥 (40.531532,116.673393) 6881.2591 km 6904.3527 km
2. 龙生九子 (40.531726,116.673538) 6881.2372 km 6904.3309 km
3. 中国第一砚 (40.531982,116.674476) 6881.2067 km 6904.3004 km
4. 古神潭峪胜景 (40.532200,116.67363) 6881.1844 km 6904.2781 km
5. 和尚跪拜 (40.532199,116.674979) 6881.1815 km 6904.2752 km
6. 一个和尚担水喝 (40.532318,116.676637) 6881.1647 km 6904.2584 km
7. 三味真火 (40.532669,116.677963) 6881.1228 km 6904.2165 km

ps:

https://web.archive.org/web/20190319220547/https://plus.google.com/112648211437438433523/posts/9jbnzKskynd