After the Big Bang, the space of the observable Universe made one incomplete revolution of at 345 degrees, and the substance in it made one complete revolution of approximately 379 degrees.

https://hal.archives-ouvertes.fr/hal-02045149

At any given time, the Hubble Constant has only a single value. However, that value has changed with time, due to the changing ratio between the mass in the Universe (which is constant) and the volume of space (which is constantly increasing).

And of course if you read different papers, there are several values, because none of them are correct. Why they are not correct is a matter of considerable debate; but there is some sort of error in the assumptions that go into interpreting the data used to calculate the value of the Constant, and no group that has obtained one value has been able to convince any group that obtained a different value that they are wrong, or tell them where they made their error. I'm sure that the value is close to 70 km/sec/Mpc, but the value quoted in any paper can be 3 or 4 km/sec larger or smaller than that, and any average used by someone should be taken with a very large grain of salt (I myself use 70 and have done so for the last 50 years for a number of reasons, and am pleased to see that it is still as good an estimate of the value as any other; but that doesn't mean that the number really is 70; just that it is close to that value).

Dear Courtney Seligman,

you could agree with your statement until May 2019. In May 2019, studies were published:

Riess, Adam G., et al: “Large Magellanic Cloud Cepheid Standards Provide a 1% Foundation for the Determination of the Hubble Constant and Stronger Evidence for Physics Beyond ΛCDM.” arXiv: 1903.07603 [astro-ph.CO].

In these studies, the value of the Hubble constant with a relative measurement error of less than 2% was determined. This value of the Hubble constant is 74.03 (+/-) 1.42 (km / s) / Mpc. Measurements are based on measuring distances to Cepheids. And measurements that are based on the study of CMB, for example, from the Planck mission:

Lilley, M., et al: "Planck 2018 results. VI. Cosmological parameters".

arXiv: 1807.06209 [astro-ph.CO].

with a relative measurement error of less than 1% give a value of 67.4 (+/-) 0.5 (km / s) / Mpc. These two facts clearly indicate that the Hubble constant has at least two equitable values. One of them, based on relict radiation, represents the process of rotation of the space of the observable Universe, and the second, based on measurement of distances to Cepheids, represents the process of rotation of substance in the space of the observed Universe. Next. For the first time experimentally (!) the failure of the hypothesis of the expansion of the space of the observable Universe under the influence of the force of dark energy was proved and experimentally (!) the fact of rotation of its space and substance was proved. This means that dark matter is the kinetic energy of the rotation of space and substance of the observable Universe:

ROTATING SPACE OF THE UNIVERSE, AS A SOURCE OF DARK ENERGY AND DARK MATTER https://hal.archives-ouvertes.fr/hal-01329145v1

Studies by Lior Shamir, which are based on experimental(!) data confirm the fact of rotation of the space of the observable Universe:

https://www.researchgate.net/publication/320038842_Large-Scale_Photometric_Asymmetry_in_Galaxy_Spin_Patterns

https://www.researchgate.net/publication/337560534_Photometric_asymmetry_between_galaxies_with_opposite_spin_patterns_A_comparison_of_three_telescopes

https://www.researchgate.net/publication/337559993_Automatic_detection_of_full_ring_galaxy_candidates_in_SDSS

The experimentally established fact of the presence of different speeds of rotation of space and matter in the observable Universe confirms the hypotheses: 1) Penrose that the space of the observable Universe, as the Hubble sphere, existed and rotated around the singularity point before the Big Bang; 2) the appearance of this speed difference precisely due to the Big Bang.

The Big Bang could have occurred as a result of a collision of an observable Universe with a neighboring universe. This scenario is confirmed by studies:

1) R. Holman (Carnegie Mellon University), L. Mersini-Houghton (UNC-Chapel Hill), Tomo Takahashi (Saga University), Cosmological Avatars of the Landscape I: Bracketing the SUSY Breaking Scale.

http://arxiv. org / pdf / hep- th / 0611223v1.pdf

2) R. Holman (Carnegie Mellon University), L. Mersini-Houghton (UNC-Chapel Hill), Tomo Takahashi (Saga University),: Cosmological Avatars of the Landscape II: CMB and LSS Signatures.

http://arxiv.org / abs / hep-th / 0612142

3) Stephen M. Feeney, Matthew C. Johnson, Daniel J. Mortlock,

and Hiranya V. Peiris ,: First Observational Tests of Eternal In action.

http://arxiv.org/pdf/1012.1995v3.pdf