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From: Farris Numerov <ovros@vmvmo.ru>
Newsgroups: sci.physics.relativity,sci.math
Subject: Re: What is a photon
Followup-To: sci.physics.relativity,sci.math
Date: Sun, 15 Jun 2025 19:01:22 -0000 (UTC)
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Paul.B.Andersen wrote:

> v = dl/dt
> 
> The distance l is measured with the odometer and the time is measured
> with a clock.

same error, time is not measured, but registered, and not time, but local 
time. Also, dl/dt makes no sense as dt is not infinitesimal zero, but it's 
an average speed, hence v = l/t would suffice. Ie 10 m/s = 10 m / 1 s