Antipode of Portsmouth, Dominica
The opposite side of the world to Portsmouth is Bilingurr, Western Australia, Australia.
Portsmouth
Dominica
Continent: America
Coordinates: 15.583, -61.456
Antipodal point
Indian Ocean
Exact location on the other side of the world
Coordinates: -15.583, 118.544
Bilingurr
Australia
Bilingurr is the closest city to Portsmouth's antipodal point (470 km).
The antipodal city to Portsmouth is Bilingurr. This means that, among all the populated locations in the world, the farthest city from Portsmouth is Bilingurr.
The distance from Portsmouth to Bilingurr is about 20,000 kilometers. A direct flight would take around 22 hours, but there aren't commercial routes between these cities.
Cities on the other side of the world of Portsmouth
This table contains the populated locations that are closest to Portsmouth's antipode. These are the farthest cities in the world from Portsmouth.
| City | Country | Distance from antipode | Coordinates |
|---|---|---|---|
| Bilingurr, WA | Australia | 470 km | (-17.909, 122.229) |
| Cable Beach, WA | Australia | 471 km | (-17.961, 122.213) |
| Djugun, WA | Australia | 472 km | (-17.954, 122.228) |
| Broome, WA | Australia | 473 km | (-17.955, 122.239) |
| Dampier Peninsula, WA | Australia | 485 km | (-16.932, 122.866) |
| Lagrange, WA | Australia | 486 km | (-18.682, 121.785) |
| Roebuck, WA | Australia | 510 km | (-18.171, 122.501) |
| Eighty Mile Beach, WA | Australia | 520 km | (-19.241, 121.613) |
| Port Hedland, WA | Australia | 523 km | (-20.312, 118.611) |
| South Hedland, WA | Australia | 534 km | (-20.407, 118.601) |
Local time:
Time Zone: America/Dominica
Coordinates: 15.5829° N 61.4559° W
Elevation: 1 m (3 ft)
Local time:
Time Zone: Australia/Perth
Coordinates: 17.9091° S 122.2292° E
Elevation: 17 m (56 ft)
How to calculate the antipodal point?
The antipode can be calculated by understanding the geographic coordinates and applying simple formulas. We will use the following variables:
- LatO: Latitude at the origin point.
- LngO: Longitude at the origin point.
- LatA: Latitude at the antipodal point.
- LngA: Longitude at the antipodal point.
Step 1: Obtain the geographic coordinates of Portsmouth
The DMS coordinates are: 15°34'58.4'' N 61°27'21.3'' W.
Calculations are easier by using the decimal format, hence:
LatO = 15.58288°
LngO = -61.45592°
Step 2: Calculate the latitude
LatA = - LatO = -15.58288°
Since the latitude is positive (north direction), the antipode must be negative (south direction).
Step 3: Calculate the longitude
LngA = LngO ± 180° = -61.45592 + 180° = 118.54408°
Since the longitude is negative, we sum 180° to ensure the final value lies between (-180, 180). If it were the other way around, we would subtract 180° for the same reason.
Result:
The antipode of Portsmouth is located on coordinates: (LatA, LngA) = (-15.58288, 118.54408)
In DMS format: 15°34'58.4'' N 61°27'21.3'' W.