The 24-hour day is not fixed but slowly stretching, and in the dinosaurs' time it was shorter: the Moon's pull is gently braking Earth's spin, so a day back then ran about 23.5 hours, and far shorter deeper in the past
Earth’s days are slowly stretching—as the Moon drifts 3.8 cm yearly, a dinosaur-era day was only 23.5 hours.
The story so far
A day on Earth isn’t a constant 24 hours; it’s lengthening, and during the age of dinosaurs a full rotation took about 23.5 hours. The finding overturns the common perception that a day is a fixed unit, highlighting that Earth’s rotation has been decelerating for billions of years.
Scientists explain that the Moon’s steady retreat—measured at roughly 3.8 centimetres per year—reduces its tidal braking, allowing Earth’s spin to slow. The Economic Times notes that a slower spin could eventually lengthen modern days and even make total solar eclipses impossible.
All natural cycles—from weather systems to biological rhythms—depend on day length, so gradual changes will ripple through ecosystems and human timekeeping. Astronauts, satellite operators and navigation services will need to adjust models as days lengthen.
Synthesized by headlinez.news from the headlines below under a strict no-invention contract. ✓ fact-checked: unsupported claims removed (67% supported) Updated 49d ago.
The obvious questions
Why is Earth’s day getting longer?
The Moon’s gravitational pull creates tidal friction that gradually slows Earth’s rotation, a process described by Space Daily.
How fast is the Moon moving away from Earth?
Measurements indicate the Moon recedes at about 3.8 centimetres per year, according to The Times of India.
What could happen if days continue to lengthen?
Scientists say longer days could eventually eliminate total solar eclipses and alter climate and biological cycles, as noted by the Economic Times.
Coverage (9)
- Why Sunday May Now Be The Shortest Day Of The Year As Earth Slows Down Forbes · 50d ago
- ‘Shortest day of 2026’ is set to come this month, though this tiny time change in Earth’s day may look ‘small’, how this 'milli-seconds shift' is threatening GPS and satellites The Times of India · 50d ago
- Did the Earth start spinning faster? One of the shortest days in history recorded Zamin.uz · 50d ago
- Climate change is slowly making our days longer, say scientists | story CBC · 50d ago
- Is The Moon Drifting Away From Earth? Here's What We Know About Our Celestial Neighbor Mashable India · 50d ago
- Moon is drifting away from Earth at 3.8 centimetres a year. What will happen to the planet as it goes further? The Times of India · 50d ago
- Moon going far from Earth: Scientists explain how it could bring longer days and end total solar eclipses The Economic Times · 50d ago
- What would happen if the moon suddenly disappeared? The Star · 50d ago
- The 24-hour day is not fixed but slowly stretching, and in the dinosaurs' time it was shorter: the Moon's pull is gently braking Earth's spin, so a day back then ran about 23.5 hours, and far shorter deeper in the past Space Daily · 50d ago
The coverage curve
How fast coverage is spreading — measured hourly from article rate × source diversity. How this works →
Topics
Related trends
New images of the sun show its surface in the finest detail yet
World's most powerful solar telescope reveals turbulent plasma whirlpools on the sun's surface for the first time.
'Crazy idea' succeeds: Scientists monitor space junk with radio telescopes
Researchers are successfully tracking orbital debris using radio telescopes, marking a shift in how small space objects are detected and monitored.
Dinosaurs were roasted to death by asteroid dust cloud
A study suggests the Chicxulub asteroid strike triggered a global dust cloud that incinerated Cretaceous-era creatures within hours.
Giant Concentric Rings Discovered in The Atmosphere of Venus
Astronomers unexpectedly spot giant concentric rings in Venus's atmosphere, sparking fresh debate on the planet’s cloud dynamics
Hubble shows star formation in Andromeda galaxy is winding down
Hubble data reveals Andromeda’s star‑birth rate has ebbed for 500 million years, signalling a middle‑age galaxy losing its newborn suns.
An ‘Eclipse Season’ Begins Today
Astronomers and skywatchers are preparing for a rare astronomical alignment as the August 'eclipse season' officially begins.