the basis for this article is an article in fornv nnen this article was edited and approved by the previous editor of fornv nnen fil dr jan peder lamm fornv nnen is a highly reputable magazine g ran h wrote the article in jan peder lamm edited the article but suggested that g ran h should include a comparison with stonehenge therefore did j p l supply g ran h with archaeological history about stonehenge g ran h re wrote the article with comparison with stonhenge and the article was published in jan peder lamm born october is a swedish archaeologist he received his phd in from the university of stockholm for a dissertation about a migration period elite cemetery near drottningholm lamm taught archaeology at the university of stockholm in the s and then worked until retirement as head curator for the swedish iron age at the museum of national antiquities in stockholm he is a member of the editorial board behind the journal fornv nnen and has taken active part in the helg project since the s fornv nnen print issn online issn is a swedish academic journal in the fields of archaeology and medieval art it is published quarterly by the royal swedish academy of letters in stockholm sweden the journal's contributions are written in the scandinavian languages english or german with summaries in english fornv nnen has the alternate title journal of swedish antiquarian research the editor in chief is lars larsson fornv nnen began publication in when it replaced two earlier journals svenska fornminnesf reningens tidskrift and vitterhetsakademiens m nadsblad early contributors included noted archaeologists oscar montelius and hans hildebrand since it has an online version since its first annual volumes have been available on line and since fornv nnen is published as a delayed open access journal with the online version of each issue appearing six months after the paper version fornv nnen is an erih category b journal according to ulrich's it is indexed in anthropological index online anthropological literature british irish archaeological bibliography online edition nordic archaeological abstracts and francis it was previously also indexed in internationale bibliographie der rezensionen geistes und sozialwissenschaftlicher literatur and linguistic bibliography henriksson g ran the grooves on the island of gotland in the baltic sea a neolithic lunar calendar paper presented at conference seac th moscow publisher institute of archaeology russian academy of sciences title astronomy of ancient civilizations isbn editor s prof tamila potemkina prof v obridko gotl ndskt arkiv is the official yearbook for the gotlandic heritage board f reningen gotlands fornv nner