The World As Seen From Gundaroo

Gundaroo is a steamy metropolis (actually a small village) in the state of New South Wales, Australia, located approximately 37 km north-north-east (as the crow flies) from the centre of Canberra, the federal capital.  This page shows two great circle maps - one centred on Gundaroo, and the other centred on the antipode of Gundaroo (the point "on the other side of the world", or diametrically opposite Gundaroo).

Back to Miscellaneous Technical Page


Great Circle Map Centred On Gundaroo

Great circle map centred on Gundaroo
A great circle map showing the world as it appears from Gundaroo.  A "great circle" distance is the shortest distance between two points on the Earth's surface, as measured along the surface of the Earth (as opposed to the straight line distance through the Earth).  The great circle map projection shows the azimuth (or bearing) from a centre location to all other locations on the Earth's surface, and the distance to each location along its bearing.  It looks very different to a Mercator projection, which is the map projection probably known and recognised by most people.  The elongated islands near the edge of the map in the north-west are the Azores - the significance of which becomes apparent when viewing the great circle map centred on the antipode of Gundaroo.

On this map; the shaded area on the right-hand half represents the nighttime side of the Earth.  This map shows Gundaroo - i
ndicated by the white circle bordered in red at the centre of the map - during evening civil twilight (just after sunset), at some time in the northern spring or autumn (fall) near the equinox. The solar position is shown as the yellow circle bordered in orange on the left-hand side of the map.  The equator (itself a great circle) is the black oval in the lower half of the map, centred on Antarctica; and the great circle formed by the 0° (Greenwich) meridian of longitude and the 180° meridian of longitude is the black oval in the left-hand side of the map.  The orange circle centred on Gundaroo (running along the Pacific west coast of North and South America, and the Indian east coast of Africa) is the 12 000 km range circle.  The range in any direction from Gundaroo to the edge of the map is 20 015 km, or half the Earth's circumference.

The orange diamonds indicate the positions of the NCDXF's International Beacon Project (IBP) beacons.  The nearest beacon is
ZL6B (New Zealand) to the east, closely followed by VK6RBP (Western Australia) to the west.  To the north-east are KH6WO (Hawaii), W6WX (USA) and 4U1UN (United Nations, located in New York).  To the south-south-east, arcing in increasing azimuth angle towards the south, are YV5B (Venezuela), OA4B (Peru), and LU4AA (Argentina).  From the south-west, curving in an arc around to the north, are ZS6DN (South Africa), 5Z4B (Kenya), 4S7B (Sri Lanka), VR2B (Hong Kong), and JA2IGY (Japan).  Further afield to the north-west are RR9O (Russia) then OH2B (Finland); while to the west are 4X6TU (Israel) then CS3B (Madeira); and far to the north is VE8AT (Canada).

As can be seen from the map, almost everywhere is a long way from Gundaroo!


Back to top

Great Circle Map Centred On The Antipode Of Gundaroo

Great circle map centred on Gundaroo antipode
A great circle map showing the world as it appears from the antipode of Gundaroo.  The antipode is the point on the Earth's surface which is diametrically opposite a given point.  The antipode of Gundaroo is located at 35°01'30'' N, 30°44'00'' W, just south of the Azores in the North Atlantic Ocean.

The projection is shown for the same time of year and day as the great circle map centred on Gundaroo (note the solar position).  T
he unshaded area on the right-hand half represents the daytime side of the Earth.  On this map, Gundaroo is everywhere on the periphery of the map, i.e. the circle bordering the map.  The equator is the black oval shown in the upper half of the map, centred on the North Pole; and the great circle formed by the 0° (Greenwich) meridian of longitude and the 180° meridian of longitude is the black oval in the left-hand side of the map.  Per the great circle map centred on Gundaroo; the orange circle centred on the antipode is the 12 000 km range circle (as measured from the antipode, not Gundaroo); and the orange diamonds indicate the positions of the IBP beacons.

Note how distorted the Australian continent appears in this projection.  This is illustrated by the position of the VK6RBP beacon on the far right-hand side of the map.  The Great Australian Bight is further to the right of the beacon.  Tasmania can be seen to the far south (below Antarctica); and the east coast is spread along the left-hand edge of the map.  The Cape York Peninsula is upside down near the top of the map, just above the island of New Guinea.

Theoretically, if you were transmitting with a beam antenna from the antipode, you could aim it in any direction in order to transmit a signal to Gundaroo.  (However; this does not take into account any propagation conditions along particular paths.)  So there would be no "short" or "long" path - all paths are the same length.


Back to top

This page was created by Mike Dower VK2IG: 25 Jan 2015.  Material may be copied for personal or non-profit use only.