Your observatory lies at a latitude of 45 N and longitude 90 W. Which object or objects can you observe from this location? An object at +87 dec, an object at -40 dec, and an object at -67 dec. I drew up a little celestial sphere for this and decided that 87 dec would be the only object I can observe. Is this correct? We couldnt observe any object with a negative dec from that location could we? thanks.