It is often hypothesized that Asadal may be a compound nouncomposed of two elements, asa and dal. This hypothesis appears to be motivated by an assumption of equivalence between the Chinese phonetic transcription 阿斯達, which is read inModern Korean as Asadal, and the word "Joseon, another name for Korea." However, the etymology of Joseon is unknown; it is not even clear whether it has been created as a phonetic transcription of a foreign name or rather as a semantic calque of a foreign name, and the Cháo reading of the first syllable of the Mandarin Chinese form is identical with the reading of this character when used to mean "dynasty," not with the reading of this character when used to mean "morning". Asa- in Asadal is sometimes claimed to be cognate with a common Korean word for "morning", probably because of obvious phonetic similarity with Japaneseasa "morning." However, the Chinese character, which is used in the modern Chinese language mainly to represent the phoneme or in word-final and preconsonantal positions when transcribing foreign words, has always had a sibilant rather than an affricate like Korean ch, and the Chinese language has plenty of characters that would be better suited to transcribing Korean ch. Dal may be the result of reading Chinese characters in the Korean way, and the original Chinese pronunciation at the time Asadal was recorded in ancient historical texts could have been "Da," a transcription of the Korean word sdah or ddang meaning "land." If such is the case, "Asadal" would mean "Morning Land." However, if "dal" has been used much like the Goguryeo city name suffix "-dal" used for mountains and cities founded on plateaus/mountains, then "Asadal" would mean "Morning Mountain."
History
The first Korean historical work that mention Asadal is the Samguk Yusa, which cites the Chinese Book of Wei. The Samguk Yusa also cites the lost historical records of Go-gi to the effect that Dan'gun's capital was located in Pyongyang. But recent studies show that there were more than one city named Pyongyang, situated in the north deep in Manchuria - possibly bordering in between China and Russia. The today Pyongyang, capital of North Korea, is actually the southern counterpart. At that time it was common for an emperor to manage two capitals and rule in two palaces. Therefore, it could be that the "true" Asadal is located in Manchuria.
