Interplanetary Time Synchronization Project Statement of Work The proposed effort involves one full time graduate student at the Masters level and one month of the principal investigator for each of two years. The proposed work is to evolve algorithms and protocols to synchronize experiment, monitoring and infrastructure platforms in the Interplanetary Internet, specifically the Earth-Mars segments of the NASA/JPL MARSnet. There are two work areas proposed. The first is to investigate issues involved in interplanetary timekeeping, considering the infrastructure limitations of the available power and propellant budget and the scientific requirements for coordinated timekeeping in the Earth and Mars vicinity. This may include protocol and algorithm enhancements for the Network Time Protocol (NTP). It is expected that orbiters will have onboard ephemerides computed as the result of ordinary housekeeping functions in space, while other platforms may have to determine availability periods and possibly beam pointing and power management functions using appropriate protocols with the more capable orbiters. The second work area is to design and implement a suitable timing simulator tool to test and evaluate the proposed enhancements. The simulator will be built using existing NTP software modules as chassis and incorporate artificial time offsets typical of the space environment. The deliverables will include a research report outlining possible design tradeoffs and proposed NTP enhancements, as well as the software simulator tool and documentation.