user: Question: When 42.903° N is the latitude how many measurements of longitude are there?
Columns: ['Date (YYYY-MM-DD)', 'Time (UTC)', 'Latitude', 'Longitude', 'Depth', 'Magnitude']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['1997-09-26', '0:33:12', '43.048° N', '12.879° E', 'km (mi)', '5.7 (M w )']
SQL:

assistant: SELECT COUNT("Longitude") FROM "Table" WHERE "Latitude" = '42.903° N';