🔍 Key Concepts

• Upper and lower transit of a celestial body across the meridian • Relationship between latitude, declination, and polar distance (colatitude vs. codeclination) • Conditions under which a star becomes circumpolar and does not set

💭 Think About

• Think about what has to be true for a body to cross your meridian twice in 24 hours so that you can see both an upper and a lower transit. • Consider how the combination of your latitude and the body’s declination affects whether the body ever goes below your horizon. • Ask yourself: in what situation would the body remain above the horizon at all times, and how does that relate to lower transit being visible?

✅ Before You Answer

• Be clear on the definitions: colatitude = 90° − latitude and polar distance = 90° − declination. • Verify which option correctly connects the body being always above the horizon with the possibility of observing it at lower transit. • Check which choices describe a geometric condition (angles) versus a geographical condition (where you are) and how that affects visibility at lower transit.