What is the difference between waxing and waning phases?

In one line

The rule

Waxing is when the visible part of the Moon increases; waning is when it decreases.

Let's understand it simply

Imagine you are watching the Moon every night from your terrace. Some nights, it looks like a thin slice, and other nights, it looks almost round. When the Moon’s bright part grows bigger each night, it is called waxing. When the bright part shrinks, it is called waning. Think of it like blowing up a balloon (waxing) and then letting the air out (waning).

How it works

1. The Moon orbits (goes around) the Earth.
2. Sunlight falls on the Moon, but we only see the part that is lit up from Earth.
3. After New Moon, the lit part grows each night — this is waxing.
4. After Full Moon, the lit part shrinks each night — this is waning.
5. The cycle repeats every 29.5 days.

Where you see it in real life

• Crescent Moon after New Moon: The thin slice grows bigger each night — this is waxing.
• Gibbous Moon before Full Moon: More than half is visible and still growing — waxing.
• Crescent Moon after Full Moon: The Moon looks like it is shrinking — this is waning.
• Gibbous Moon after Full Moon: More than half is visible but getting smaller — waning.
• Karva Chauth: People look for the waxing Moon in the evening sky.
• Eid: The sighting of the new crescent (waxing) Moon marks the festival.

Why it matters

• Helps farmers know the best time to plant or harvest crops.
• Used in calendars to mark months and festivals.
• Important for sailors and fishermen who use the Moon for tides.
• Many Indian festivals depend on the Moon’s phases.

Common mistakes

• Thinking waxing means the Moon is moving closer — it is just the lit part growing.
• Mixing up waxing and waning: Remember, waxing = growing, waning = shrinking.
• Believing the Moon changes shape — it’s only the visible part that changes.

Remember it

Wax on = growing; waning = waning away (shrinking).