What started the question
A Moon over the kites.
At the kite festival in Ahmedabad on Makar Sankranti, Meera saw the Moon in broad daylight with the Sun still up - and she had always taken it for a night-time object.
📚 Chapter Learning Kit
Keeping Time with the Skies · Class 8 Science · Curiosity
English 5 topics 175 leveled MCQs 85 flashcards 5 games Free
Shared by a Veda teacher · Generated with Veda AI · Oct 2026
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The puzzle underneath
Two facts that do not fit.
The Moon is a sphere, and it shines by reflecting sunlight. Put those together and the whole lit sphere ought to show every night.
How to watch for a month
Start the morning after a full Moon.
Find the Moon at sunrise, in the west, and draw the bright part. Then do it every day for a fortnight.
What does not change
Hold two facts still.
The Moon is a sphere and it stays one. It makes no light of its own and shines only by reflecting the sunlight that falls on it.
Half lit, every single day
Light comes from one side.
Sunlight arrives from one direction, so the half of the Moon turned towards the Sun is lit and the half turned away is not.
The half that faces us
The bit people miss.
The Moon goes round the Earth and the same half of it always faces us.
📖 Smart notes
What you'll study, topic by topic
1
The Phases of the Moon
The bright part of the Moon shrinks for a fortnight and grows for a fortnight, and the whole cycle - Purnima to Amavasya and back - takes about a month.
- The Moon is a sphere and shines by reflecting sunlight; it gives out no light of its own.
- The changing shapes of its bright part, as seen from Earth, are called its phases.
- The bright part shrinks from a full circle to nothing over about a fortnight, which is the waning period.
~40 min · full explanation, examples & memory tricks in the app
2
Why the Shape Changes
Two halves to keep track of - the half the Sun lights and the half that faces us - and we see only the overlap, which is all the phases are.
- The Moon is a sphere that makes no light of its own and shines by reflecting sunlight.
- The half of the Moon turned towards the Sun is lit and the half turned away is not, every day of the month.
- The same one and the same half of it always turns towards the Earth as it goes round.
~50 min · full explanation, examples & memory tricks in the app
3
Finding the Moon, and Measuring Time
Where to look for the Moon and why moonrise slips fifty minutes a day - and how a spin, an orbit and an orbit give us the day, the month and the year.
- At the full Moon it stands almost opposite the Sun, setting in the west as the Sun rises in the east.
- As the bright part shrinks, the Moon appears closer to the Sun in the sky.
- When the bright part is a half circle, the Moon is overhead at sunrise.
~50 min · full explanation, examples & memory tricks in the app
4
Lunar, Solar and Luni-Solar Calendars
Twelve lunar months fall eleven days short of the seasons, and the three kinds of calendar are three different answers to that one arithmetic problem.
- About twelve cycles of the Moon’s phases fit inside one cycle of the seasons, which is where calendars begin.
- Twelve lunar months come to 354 days while the seasons return in about 365, so a lunar calendar drifts by about eleven days a year.
- Solar calendars fix the year to the seasons; the Gregorian calendar is one, with months adding to 365 days.
~50 min · full explanation, examples & memory tricks in the app
5
Festivals and Satellites
Why festival dates move by a few days, by a month or hardly at all - and what the specks of light crossing the evening sky are doing up there.
- Most festivals in India are set by the phases of the Moon, so they follow lunar or luni-solar calendars.
- Diwali is kept at the new Moon of Kartika and Holi at the Phalguna full Moon.
- A luni-solar festival shifts within a window of less than a month, because of the extra month inserted every few years.
~50 min · full explanation, examples & memory tricks in the app
❓ Leveled MCQ practice
Try the smart MCQs from this kit
175 questions laddered from warm-up to topper-level, each with an explanation. A taste:
The phases of the Moon are
Beginner
A the changing shapes of its bright part
B the changes in the size of the Moon
C the eclipses that it passes through
D the times at which it rises and then sets
Show answer & explanation
the changing shapes of its bright part
The shapes of its bright part as seen from Earth, which is a description of our view.
The Moon is visible at all because it
Beginner
A is lit by the lights of the Earth
B reflects the sunlight falling on it
C produces a light of its very own
D glows from the heat of its own surface
Show answer & explanation
reflects the sunlight falling on it
It gives out no light of its own, which is why only its lit half can ever be seen.
During the waning period, the bright part of the Moon
Beginner
A stays exactly the same size throughout
B changes its colour from white to red
C shrinks from a full circle to nothing
D grows from nothing to a full circle
Show answer & explanation
shrinks from a full circle to nothing
Two weeks of shrinking, which in India is generally called Krishna Paksha.
Which Indian name is given to the fortnight of growing?
Beginner
A Krishna Paksha
B Purnima
C Amavasya
D Shukla Paksha
Show answer & explanation
Shukla Paksha
Shukla Paksha is the waxing fortnight; Krishna Paksha is the waning one.
🃏 Flashcards
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85 flashcards in this kit — the app reviews them with spaced repetition so the right card returns on the right day.
🎮 Learning games
Play your way through this kit
Every game is built from this kit's own content — scores feed your mastery, so playing counts as studying.
Categorization
Fact Or Myth
Sequence Builder
Memory Match
Speed Quiz
Playable in the app
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