When magnetic compasses do not define properly the azimuth of a core (a strongly magnetized rock, being too close to the magnetic poles...)
paleomagnetists use a sun compass. A sun compass is a sun-clock projected over a gnomon. Upload a file and calculate your core azimuths!
Data file must contain commas, spaces or tabulation delimited Name, Date (yyyy:mm:dd:hr:min), Δu*, Site Latitude, Site Longitude, Shadow
angle. Δu is the time to SUBSTRACT from local time for Universal time. An example input file is here.