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\title{Science AMA Series: I'm Stephen Gill, an oceanographer and chief
scientist with NOAA's Center for Operational Oceanographic Products and
Services. With a full moon and a perigee on September 28, I'm he}



\author[1]{NOAAgov }%
\author[1]{r/Science AMAs}%
\affil[1]{Affiliation not available}%


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  \date{April 23, 2026}


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\begin{abstract}
Hello! I am Stephen Gill, an oceanographer with NOAA. I've been studying
sea level and tides and currents for the past 40 years. My office within
NOAA is responsible for providing near real-time tides, currents, and
Great Lakes water level information. These data are quality controlled
to compile long-term archived data sets that can be used to produce tide
and tidal current predictions among other important products such as
tidal datums and sea level trends. As you may know, tides vary with the
changes in the alignments of the Earth-Moon-Sun system. In general, the
closer the alignment of the three bodies, the greater the tides are. One
special alignment that occurs a few times each year is the perigean
spring tide and we are currently experiencing one of these events right
now. September 28 is especially noteworthy because Perigee and the Full
Moon occur within a few hours of each other on this day, resulting in
high tides being among the highest and lowest for 2015 in many coastal
locations. I'll be here from 1:00 p.m. ET (10 am PT, 5 pm UTC) to 3:00
p.m. ET to answer your questions on perigean spring tides. For more
information about me, my bio can be found online at
http://oceanservice.noaa.gov/news/sep15/reddit.html%
\end{abstract}%



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