In wireless sensor networks, many applications rely on the ability of sensor 
nodes to estimate their physical location and time with respect to a common 
reference scale. This necessity is reflected by the development of a 
significant number of algorithms for localization and time synchronization for 
sensor networks in the recent past. However, research on location estimation 
on the one hand and on time synchronization on the other hand has been largely 
separated. Despite this, models, requirements, techniques, and algorithms of 
the two domains are rather similar and in some respects closely related. The 
purpose of this paper is to make this affinity explicit, with the hope of 
stimulating a mutual fertilization and enabling a better understanding of both 
domains.