The same nominal distance
The comparison uses 1,500 nautical miles for both Thor and Jupiter: 2,778 kilometres, usually rounded to 2,780 km. The RAF historical specification gives this figure for Thor; a contemporary US National Security Council briefing gives it for Jupiter.
A nautical mile is longer than a statute mile. Treating “1,500 miles” as an unqualified figure would produce the wrong comparison.
Sources for this passage: [1] [5]A distance boundary, not a war plan
Each outline joins points at that distance from its origin, calculated over a spherical Earth. It is an illustrative maximum-range boundary, not a list of assigned targets, a minimum-range limit, a flight path or a blast radius. Areas within an outline are not automatically evidence of feasible or planned attacks.
The Mercator display stretches northern latitudes, so equal ground distances can look unequal on the screen. The distances are calculated before projection, rather than drawn as flat circles on the map.
Approximate places, explicit assumptions
British points reuse the station-area coordinates in the Thor directory. The Italian reference is approximately 40.80°N, 16.93°E; the Turkish reference is approximately 38.50°N, 27.10°E. These are editorial area anchors for comparison, not surveyed launch pads.
Moving the origin changes the outline. One range from Gioia del Colle or İzmir does not represent the combined reach of every dispersed site. The map therefore presents the three origins and their limitations alongside the controls.
Sources for this passage: [1] [2] [3]Keep the settlement distinct
The private assurance to the Soviet leadership concerned the removal of Jupiter missiles from Turkey. It should not be retold as one identical bargain covering all the missiles shown here. Thor withdrawal was already being planned before the crisis.
The map explains geography. The decisions about alert levels, authorisation, alliance politics and withdrawal need their own documentary context.
Sources for this passage: [4] [1]Britain and the crisis · Thor equipment profile