I'm taking figures from https://en.wikipedia.org/wiki/Rotational_energy https://en.wikipedia.org/wiki/Rotational_energy Moment of inertia of the Earth: I=8.04e

I'm taking figures from https://en.wikipedia.org/wiki/Rotational_energy https://en.wikipedia.org/wiki/Rotational_energy Moment of inertia of the Earth: I=8.04e37 Angular velocity, with sidereal rotation period of 23.93 hours: ω0=2π/(23.93 × 3600) Angular velocity, with sidereal rotation period of 23.93 hours plus one second: ω1=2π/(23.93 × 3600 + 1) Rotational energy difference: .5 × I × ω0 ** 2 - .5 × I × ω1 ** 2 ≈ 4.96e+24 J For comparison, according to https://ourworldindata.org/energy-production-consumption https://ourworldindata.org/energy-production-consumption the total amount of energy consumed on Earth in 2023 was 180E3 TWh i.e. 6.48e+20 J Slowing down the Earth by one second would be equivalent to 7661 times this amount.