Subjects
Choose questions individually, practise online, or create a worksheet with matching answers. Counts include generated variants, not only authored originals.
Earth's rotation
Rotation changes the direction an observer faces in space.
Axial tilt and the changing sunlight geometry
Tilt changes sunlight angle and daylight duration over the orbit.
We see different portions of the illuminated half
Normal phases are viewing geometry, not lunar eclipses.
15 degrees
360/24=15 degrees.
The visible sky and object directions depend on where and when observations occur. These records allow a meaningful comparison.
Credit both spatial and temporal context.
Use a trusted solar image or a diagram
Do not directly view the Sun with unsuitable optics or filters.
Earth rotates, causing the apparent daily movement of the sky. An observation should record time, direction and location rather than assume all observers see the same view.
Grades 6–9Earth rotates, causing the apparent daily movement of the sky. An observation should record time, direction and location rather than assume all observers see the same view.
Grades 6–9A telescope collects light over an aperture. In a simple unobstructed comparison, collected power scales with diameter squared.
Grades 9–12A telescope collects light over an aperture. In a simple unobstructed comparison, collected power scales with diameter squared.
Grades 9–12Learn sky motion, the Solar System, astronomical light and safe telescope interpretation.
Connect parallax, magnitudes and stellar structure to evolutionary paths and remnants.
Explore two-body motion, spacecraft data, planet detection and atmospheric interpretation.
Study galaxy models, cosmic expansion, black holes and uncertainty in astronomical measurements.