Strato of Lampsacus

Strato of Lampsacus (/ˈstreɪtoʊ/; Ancient Greek: Στράτων ὁ Λαμψακηνός, romanized: Strátōn ho Lampsakēnós, c. 335 – c. 269 BCE) was a Peripatetic philosopher, and the third director (scholarch) of the Lyceum after the death of Theophrastus. He devoted himself especially to the study of natural science, and increased the naturalistic elements in Aristotle's thought to such an extent, that he denied the need for an active god to construct the universe, preferring to place the government of the universe in the unconscious force of nature alone.

Strato, son of Arcesilaus or Arcesius, was born in Lampsacus between 340 and 330 BCE. He might have known Epicurus during his period of teaching in Lampsacus between 310 and 306 BCE. He attended Aristotle's school in Athens, after which he went to Egypt as tutor to Ptolemy II, where he also taught Aristarchus of Samos. He returned to Athens after the death of Theophrastus (c. 287 BCE), succeeding him as head of the Lyceum. He died sometime between 270 and 268 BCE.

Strato devoted himself especially to the study of natural science, whence he obtained the name of Physicus (Greek: Φυσικός). Cicero, while speaking highly of his talents, blames him for neglecting the most important part of philosophy, that which concerns virtue and morals, and giving himself up to the investigation of nature. In the long list of his works, given by Diogenes Laërtius, several of the titles are upon subjects of moral philosophy, but the great majority belong to the department of physical science. None of his writings survive, his views are known only from the fragmentary reports preserved by later writers.

Strato emphasized the need for exact research, and, as an example of this, he made use of the observation of how water pouring from a spout breaks into separate droplets as evidence that falling bodies accelerate.

Whereas Aristotle defined time as the numbered aspect of motion, Strato argued that because motion and time are continuous whereas number is discrete, time has an existence independent of motion, or simply that time was the quantitative aspect of motion, rather than its numerical aspect. Simplicius preserves the following quotation in his commentary on Aristotle's Physics:

For we say we that we go abroad or sail or go on a military campaign or wage war for much time or for little time, and similarly, that we sit and sleep and do nothing for much time and for little time: for much time in the cases where the quantity is much, for little where it is little. For time is the quantitative in each of these. And this is why some people say that one and the same [thing] came slowly, others quickly, according to how the quantitative in this seems to each group. For we saw that that is quick in which the quantity from when it began to when it stopped is small, but much happened in this [interval]. Slow is the opposite, when the quantity in it is much, but what has been done is little. And for this reason, there is no quick and slow in rest, for all is equal to its own quantity, and neither much in a small quantity, or short in a large one. And this is why we speak of more and less time, but not of quicker or slower time. For an action and a motion can be quicker or slower, but the quantity in which the action is, is not quicker and slower, but more and less, like the time. Day and night, and month and year are not time or parts of time, but the former are light and dark, the latter the circuit of the moon and sun, while time is the quantity in which these are.

He rejected the Aristotelian belief of "natural places" in exchange for a mechanical view in which objects do not gain weight as they fall, instead arguing that the greater impact was due to an increase in speed.

He was critical of Aristotle's concept of place as a surrounding surface, preferring to see it as the space which a thing occupies. He also rejected the existence of Aristotle's fifth element.