Question: Why is it impossible to provide an undisputed description of the battle?
About the article "Battle of Hastings", section "Background and location".

Candidate passages:
Background and location.
Because many of the primary accounts contradict each other at times, it is impossible to provide a description of the battle that is beyond dispute.
The only undisputed facts are that the fighting began at 9 am on Saturday 14 October 1066 and that the battle lasted until dusk.
Sunset on the day of the battle was at 4:54 pm, with the battlefield mostly dark by 5:54 pm and in full darkness by 6:24 pm.
Moonrise that night was not until 11:12 pm, so once the sun set, there was little light on the battlefield.
William of Jumieges reports that Duke William kept his army armed and ready against a surprise night attack for the entire night before.
The battle took place north of Hastings at the present-day town of Battle, between two hills – Caldbec Hill to the north and Telham Hill to the south.
The area was heavily wooded, with a marsh nearby.
The name traditionally given to the battle is unusual – there were several settlements much closer to the battlefield than Hastings.
The "Anglo-Saxon Chronicle" called it the battle "at the hoary apple tree".
Within 40 years, the battle was also known as "Senlac", a Norman-French adaptation of the Old English word "Sandlacu", which means "sandy water".
This may have been the name of the stream that crosses the battlefield.
The battle was already being referred to as "bellum Hasestingas" or "Battle of Hastings" by 1087, in the "Domesday Book".
Sunrise was at 6:48 am that morning, and reports of the day record that it was unusually bright.
The weather conditions are not recorded.
The route that the English army took to the battlefield is not known precisely.
Several roads are possible: one, an old Roman road that ran from Rochester to Hastings has long been favoured because of a large coin hoard found nearby in 1876.
Another possibility is a Roman road between London and Lewes and then over local tracks to the battlefield.
Some accounts of the battle indicate that the Normans advanced from Hastings to the battlefield, but the contemporary account of William of Jumieges places the Normans at the site of the battle the night before.
Most historians incline towards the former view, but M. K. Lawson argues that William of Jumieges's account is correct.
It is impossible to determine accurate location of the central or precentral sulci from an endocast.
Still it can provide a rough idea of lobe sizes. 
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Historical sources on the revolt of Bardas Skleros differ on the sequence and location of the battles that ended it, one of which was fought at the plain of Pankaleia (Παγκάλεια), northeast of Amorium.
The history of John Skylitzes, written in the late 11th century, reports that Skleros won a first battle near Amorium, as well as a second at Basilika Therma (modern Sarıkaya), and that it was in a third engagement at Pankaleia that Phokas triumphed.
According to Skylitzes, Phokas had been reinforced with Georgian troops from Tao through his friendship with its ruler, David, but his army again began to give way.
Phokas then charged towards Skleros and engaged him in single combat, in which the rebel general was wounded and fled, sowing panic among his men.
The late 10th-century writer Leo the Deacon on the other hand writes that the loyalist army under Bardas Phokas first encountered the army of Skleros at Pankaleia and was defeated, but secured a decisive victory in a second battle at an unspecified location.
Other authors provide some further details: Michael Psellos also reports the duel of the two generals at the decisive battle, while the early 11th-century Christian Arab historian Yahya of Antioch alludes to two battles, and gives the dates as 19 June 978 and 24 March 979 respectively.
What is undisputed is that after his defeat, Skleros fled to his Arab ally, the Hamdanid emir Abu Taghlib, and thence sought refuge in the Buyid court in Baghdad, where he remained for the next seven years.
Based on Georgian sources, P.M. Tarchnichvili suggested in 1964 that the victory of Phokas took place at a site called "Sarvenis" in Georgian, which he identified as Aquae Saravenae, north of Caesarea (modern Kırşehir), and that Skylitzes's third battle (who erroneously places Pankaleia near the river Halys, which corresponds to the site of Kırşehir) is a fictionalized mixture of the real first and second battles, a view shared also by John Forsyth in his 1977 critical edition of Yahya's chronicle in English.
According to Catherine Holmes, Skylitzes' account, although doubtlessly embellished, probably relies on an actual source given its level of detail, but that in the end "adjudicating between these possibilities is all but impossible" and that the only certain thing is that the decisive final battle took place in March 979.
Earlier scholars, like George Finlay and George Ostrogorsky, generally accepted the account of John Skylitzes, with the decisive final battle between Skleros and Phokas at Pankaleia in March 979, sometimes labelled the "second" Battle of Pankaleia, depending on whether the first battle between the two generals near Amorium was also regarded as taking place at the same site.
Modern scholars on the other hand have adopted a different reconstruction of events, with a first battle taking place at Pankaleia in June 978, a second battle some time at Basilika Therma in Charsianon later in autumn/winter, and with the third and decisive battle taking place at Sarvenis in March 979; 
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