The Mishnah gives the daily service a tractate of its own, and it is unusual among them. Instead of arguing law it narrates a procedure, from the moment the priests rise in the chamber where the night watch slept to the moment the offering is complete. The lots by which the duties were assigned, the priest sent out to see whether the light had reached the point at which slaughter could begin, the doors whose opening could be heard at a distance, the order in which the limbs were carried up the ramp: it reads like an eyewitness account and it was not written by an eyewitness. The tractate was redacted long after the last lamb was offered, and how much of the detail is memory and how much is reconstruction is a real question rather than a rhetorical one. This is the general problem of the whole subject in its sharpest form, because here the source is at its most circumstantial and therefore at its most persuasive.
The cessation of the daily offering is remembered as a calamity in its own right, separately from the destruction of the building that housed it. Rabbinic tradition places it among the events of the seventeenth of Tammuz, three weeks before the ninth of Av, which is why the fast of Tammuz opens the sequence it does.
One confusion is worth clearing away. The atlas also holds Ner Tamid, the perpetual lamp that burns before the ark in a synagogue. It shares the adjective and nothing else. The lamp is a fitting of a later building; the offering is a rite of a demolished one. The two are commonly run together because the word tamid does similar work in both names, and the link between the two rows here is marked as a conflation rather than as a connection.