What term is used for a moon that occurs on the second full moon within a calendar month?
Show answer & explanation
Correct answer: B
Explanation
Solution: The correct answer is Blue moon.
Explanation:
☛ A Blue moon is commonly defined as the second full moon occurring within a single calendar month.
☛ A complete lunar cycle (synodic month) takes approximately 29.53 days, while most calendar months have 30 or 31 days.
☛ Due to this time difference, an extra full moon accumulates over time, occurring approximately once every 2.5 to 3 years.
☛ Historically, another definition (seasonal Blue Moon) refers to the third full moon in an astronomical season that contains four full moons instead of the usual three.
Extra Exam-Relevant Facts:
☛ Blood moon: Occurs during a total lunar eclipse when the Moon takes on a reddish-orange hue due to Rayleigh scattering of sunlight passing through Earth's atmosphere.
☛ Supermoon: Happens when a full moon coincides with the Moon's closest approach to Earth in its elliptical orbit, known as perigee, making it look noticeably larger and brighter.
☛ Harvest moon: The full moon that appears nearest to the date of the autumnal equinox (around September in the Northern Hemisphere).
☛ Micromoon: Occurs when the full moon coincides with the Moon's farthest point from Earth in its orbit, known as apogee.
Important One-Liners for Upcoming Exams:
☛ What is the average duration of a synodic month (from one full moon to the next)? → Approximately 29.5 days
☛ What is the point in the Moon's orbit where it is closest to Earth called? → Perigee
☛ What is the point in the Moon's orbit where it is farthest from Earth called? → Apogee
☛ Which optical phenomenon gives the Blood Moon its reddish color during a lunar eclipse? → Rayleigh scattering
☛ What is the event called when the Moon passes directly into the Earth's shadow? → Lunar eclipse