<P> For example, a certain flight may have a calculated ETA based on the speed by which it has covered the distance traveled so far . The remaining distance is divided by the speed previously measured to roughly estimate the arrival time . This particular method does not take into account any unexpected events (such as new wind directions) which may occur on the way to the flight's destination . </P> <P> ETA is also used metaphorically in situations where nothing actually moves physically, as in describing the time estimated for a certain task to complete (e.g. work undertaken by an individual; a computation undertaken by a computer program; or a process undertaken by an organization). The associated term is "estimated time of accomplishment", which may be a backronym . For example, Bittorrent clients specify ETA as the expected time remaining for a file to completely download as 1d4h (1 day and 4 hours), 1w2d (1 week and 2 days), etc . </P> <P> Accurate and timely estimations of times of arrival are important in several application areas: </P> <Ul> <Li> In air traffic control arrival sequencing and scheduling, where scheduling aircraft arrival according to the first - come - first - served order of ETA at the runway minimizes delays . </Li> <Li> In airport gate assignment methods, to optimize gate utilization . </Li> <Li> In elevator control, to minimize the average waiting time or journey time of passengers (destination dispatch). </Li> </Ul>

Name the point and time of departure and arrival at the end of the day