Normalnull ("standard zero") orNormal-Null (shortN. N. orNN) is an outdated officialvertical datum used in Germany. Elevations using this reference system were to be markedMeter über Normal-Null (“meters above standard zero”).Normalnull has been replaced byNormalhöhennull (NHN).
In 1878 reference heights were taken from theAmsterdam Ordnance Datum and transferred to theNew Berlin Observatory in order to define theNormalhöhenpunkt 1879.Normalnull has been defined as a level going through an imaginary point 37.000 m belowNormalhöhenpunkt 1879. When the New Berlin Observatory was demolished in 1912 the reference point was moved east to the village ofHoppegarten (now part of the town ofMüncheberg, Brandenburg, Germany).[1]
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52°30′12″N13°23′35″E / 52.5034°N 13.3930°E /52.5034; 13.3930
