What if the ancient concept of Brahma—the cosmic observer who sees and understands the universe beyond the limitations of ordinary human perception—could be imagined through the lens of modern physics?
It may sound like an unusual question, but a fascinating thought experiment emerges when the ancient description of the four Yugas is viewed alongside Einstein’s theory of relativity and the phenomenon of time dilation.
Let us imagine an observer whom we shall call Brahma. He is not an ordinary observer on Earth. Instead, he occupies a hypothetical cosmic frame from which he observes the motion of the Earth. For convenience, we may associate this frame with the cosmological reference frame defined by the cosmic microwave background (CMB), against which the Solar System’s motion is measured at roughly 370 km per second.
Now comes the intriguing part.
Suppose, purely as a thought experiment, that the Earth—or the frame in which its inhabitants exist—were moving at different fractions of the speed of light during four successive cosmic ages.
Let the velocity during Satya Yuga be 0.992c, during Treta Yuga 0.986c, during Dvapara Yuga 0.968c, and during Kali Yuga 0.866c, where c is the speed of light.
Einstein’s special theory of relativity tells us that as the velocity of an object approaches the speed of light, time for that moving object passes more slowly relative to an observer in another inertial frame. The mathematical quantity involved is the Lorentz factor:
γ = 1 / √(1 − v²/c²)
Applying this equation to the four hypothetical velocities produces a remarkable pattern.
At 0.992c, the Lorentz factor is approximately 7.9.
At 0.986c, it is approximately 6.0.
At 0.968c, it is approximately 4.0.
And at 0.866c, it is approximately 2.0.
The ratios are therefore strikingly close to:
4 : 3 : 2 : 1.
In other words, relative to the hypothetical observer Brahma, a unit of elapsed time experienced by people moving at 0.992c would correspond to roughly four times the time experienced at 0.866c. Similarly, the corresponding ratios for the second and third velocities would be approximately three and two.
This creates an intriguing parallel with the traditional description of the four Yugas, in which Satya Yuga is described as four times the duration of Kali Yuga, Treta Yuga as three times, and Dvapara Yuga as twice the duration of Kali Yuga.
Could this be what the ancient tradition was metaphorically describing?
That is where the thought experiment becomes truly fascinating.
If Satya Yuga = 0.992c, Treta Yuga = 0.986c, Dvapara Yuga = 0.968c, and Kali Yuga = 0.866c, then relativity provides a mathematical mechanism through which time experienced by people in the respective ages could appear in the ratio 4:3:2:1 to an external observer.
The same reasoning could also offer an imaginative interpretation of the traditional claim that human beings lived progressively longer lives in the earlier Yugas. If biological ageing is assumed to proceed according to the passage of proper time experienced by the people themselves, then an external observer could see their clocks and biological processes running progressively slower as their relative velocity increased.
There is, however, an important scientific caveat.
Physics does not identify the CMB frame as an absolute or universally privileged frame. Special relativity has no preferred inertial observer. The CMB merely provides a convenient cosmological reference frame in which the universe appears broadly isotropic. Therefore, calling Brahma a “universal observer” is a philosophical interpretation, not a conclusion established by relativity.
Yet that qualification does not diminish the beauty of the thought experiment.
Perhaps the point is not to claim that the ancient sages secretly possessed Einstein’s equations. Nor should a numerical coincidence automatically be presented as scientific proof of the Yuga theory.
Rather, it invites an intriguing question: could an ancient description of cosmic time have been conceived from a perspective radically different from ordinary human time?
Modern physics has already taught us that time is not absolute. It depends upon motion and the observer’s frame of reference. Ancient Indian thought, meanwhile, has long imagined time on enormous cosmic scales and distinguished between human time and divine or cosmic time.
Seen in that light, Brahma need not be imagined merely as a deity sitting somewhere outside the universe with a gigantic clock. He can, in this thought experiment, represent the ultimate cosmic observer—a perspective from which the passage of time is radically different from what humans experience.
Whether that is merely a fascinating numerical coincidence or something that deserves deeper philosophical investigation is open to debate.
But one thing is certain: when relativity meets the Yugas, the ancient question of whose clock defines time suddenly becomes remarkably modern.
