An old mate of yours that lives in Barcaldine, QLD (23.65, 145.28E) gives you a phone call close to midday on the day of the summer solstice to tell you that their homemade sundial (a long piece of construction wood standing vertically in their courtyard) isn't leaving a shadow beneath the Sun! At this point, you remember Dr Carter saying something about an ancient Greek bloke who used this exact situation to measure the circumference of the Earth! So, filled with enthusiasm, you grab out your 100 cm stick and place it vertically in the ground at your "Home" in Melbourne (37.85, 145E), and you measure the shadow to be 25.34 cm long. Use this measurement to calculate the circumference of the Earth, to the nearest km (i.e., 0 decimal places), using the assumption that the distance to your mate's location is 1,574.5 km. Hint: Be sure to carry through at least 3 decimal places in your calculations. OSM + relief shading ME Northern Territory Tracks: Queensland 1574.5 km O Brisbane Gold Coast South Australia Australian New South Wales Eight Sydney Adelaide Canberra Victor MelbourneHint: Be sure to carry through at least 3 decimal places in your calculations. OSM + relief shading VE Northern Territory E Tracks: Queensland 1574.5 km O O Brisbane Gold Coast South Australia or Australian New South Wales Bight Sydney Adelaide Canberra Victor Melbourne Center: -31.05024,143.80162 Tasmania 300 km Map created at GPSVisualizer.com Leaflet | Map data from OpenStreetMap.org. relief from ESRI/ArcGIS