The Earth is Flat

I read my opponent's R2 speech as far as "While counter-arguments are acceptable, I ask that my opponent refrains from making any specific rebuttals to my argument in the second round", and stopped reading there. I will construct the rest of my R2 argument based solely on what I have read up until this point, so as to respect my opponent's wishes to keep rebuttal to the final round, and as such will not have read my opponent's R2 argument until the beginning of R3. I would suggest, however, that next time my opponent should make such a desire clear in R1, before the acceptance, as someone may prefer to have rebuttals as the debate goes along and I don't think it would be fair to them to not allow this having not made that clear before the acceptance. Before I begin arguing, I would like to point out that for the duration of the debate, I will use the term "round" to mean "approximately spherical"; I recognise the Earth is not a perfect sphere. My arguments will be as follows: 1) The motion is not clearly defined, and therefore may not be considered true. 2) Photographic evidence indicates that the Earth is round. 3) Navigation indicates that the Earth is round. 4) The absence of an edge indicates that the Earth is round. 5) The apparent position of the sun indicates that the Earth is round. The motion asserts that "The Earth is flat", but does not make it clear what is meant by this; we would surely all agree that in smaller sub-areas, the Earth is approximately flat. Likewise, we would all agree that in some areas, the Earth is clearly not flat, for instance, near sheer cliffs. Ambiguity in the motion is usually considered to work in con's favour, and there is certainly ambiguity in this motion. Photographic evidence indicates that the Earth is round (See sources 1:3). Little more really needs to be said about this; just look- it's round! Navigation also indicates that the Earth is round because it is possible to circumnavigate the globe by travelling due East or due West continuously- were the Earth flat, this would not be possible. Indeed, individuals have circumnavigated the globe, and specific details of this can be seen under sources 4 and 5. If the Earth were flat, it would either have to continue on indefinitely and be infinitely large, or it would have to have a clear edge, beyond which there would be no Earth. Clearly, the Earth is finitely large, as we have successfully sent probes far away enough that they can no longer view the Earth, and an infinitely large Earth would always be within the probe's field of view. Therefore, a flat Earth would have to have an edge, and such an edge has never been detected (See source 6), but would have been were such an edge to exist. Day and night are caused by the Earth rotating on its axis such that the sun is no longer visible on one side of the Earth (See sources 7 & 8). Though a similar phenomenon would occur were the Earth a flat disc that flipped in a direction perpendicular to its own plane, the patterns such a process would produce would look different; light and dark would occur almost instantaneously on either side of the Earth, and sunrise and sunset would take a matter of minutes. The sun would also move in a continuous vertical line from one horizon to the other, with no curvature, and would appear perfectly perpendicular to the Earth's plane at mid-day. In reality, neither of these predictions are shown to be true; sunrise and sunset lines move continuously across the Earth's surface with an angular frequency of exactly 7.2921159 " 10W22;5 radians/second, and these lines are curved and not flat. This is exactly as predicted by a round-Earth model. The sun's apparent position also does not follow an infinite straight line, but rather an "n" shape as it arcs across the sky, and only appears to be directly overhead at midday on the equator. Once again; the predictions more closely match that of a round-Earth model than a flat-Earth model. So, in conclusion: 1) The motion is not clearly defined, and therefore may not be considered true. 2) Photographic evidence indicates that the Earth is round. 3) Navigation indicates that the Earth is round. 4) The absence of an edge indicates that the Earth is round. 5) The apparent position of the sun indicates that the Earth is round. Sources 9:12 are further evidence one can use to demonstrate that the Earth is round, and not flat. Sources and further evidence: 1: https://www.google.co.uk...;*&imgrc=hn9QEoxVgXzaRM: 2: https://www.google.co.uk...;*&imgrc=VkwHFoyDcBysxM: 3: https://www.google.co.uk...;*&imgrc=ccWADxn-RiOvFM: 4: https://en.wikipedia.org... 5: https://en.wikipedia.org... 6: https://www.google.co.uk...;*&imgrc=dkd6YVq_CP1fZM: 7: http://sciencing.com... 8: https://www.dkfindout.com... 9: http://www.popsci.com... 10: http://www.smarterthanthat.com... 11: http://www.physlink.com... 12: https://futurism.com...