This paper discusses some aspects of cosmological expansion as viewed by an observer. It identifies the rate of change of the angular distance v_&Theta with respect to the observer’s clock as a crucial quantity in adequately understanding the expansion. Using this quantity and the angular distance in addition to the traditional illustration approach provides a more vivid picture of the cosmological expansion and is key for its adequate visualization.

PACS: 98.62.Py, 98.80.−k, 98.80.Es (all) DOI: 10.3367/UFNe.0184.201407f.0767 URL: https://ufn.ru/en/articles/2014/7/e/ 000343769200005 2-s2.0-84907903173 2014PhyU...57..702P Citation: Toporensky A V, Popov S B "The Hubble flow: an observer's perspective" Phys. Usp. 57 708–713 (2014) BibTexBibNote ® (generic)BibNote ® (RIS)MedlineRefWorks Received: 2nd, September 2013, revised: 15th, October 2013, accepted: 15th, October 2013 Оригинал: Топоренский А В, Попов С Б «Хаббловский поток в картине наблюдателя» УФН 184 767–774 (2014); DOI: 10.3367/UFNr.0184.201407f.0767