I.e. there no counter-argument to an object wtih a name=“North pole”?
I haven’t seen anybody denied existense of “North pole” after 89 messages.
Based on http://wiki.openstreetmap.org/wiki/Key:name, we should use tag name=“North pole” or int_name=“North pole”
Open question: what geometry to use? Should we use relations instead of geometries?
IMO “49th parallel” is just a description, not a NAME a billions of people will recognize (“North pole”, “South pole”).
As I said, if there questions, we can refer to Wikipedia definitions:
Actually there ONLY 5 “major” and “named”:
https://en.wikipedia.org/wiki/Template:Geographical_coordinates
https://en.wikipedia.org/wiki/Circle_of_latitude#Major_circles_of_latitude
To me, it is clear that Equator can be used in geo-coding.
IF there users prefer to see
+0.0
-0.0
In their software, then it is fine.
I consider removal of a tag name=“Equator” (or int_name=“Equator”, if you prefer) as pure vandalism. And you haven’t commented why to remove name= tag* in your Russian reply too. There 89 messages in this discussion, but not a single explanation “Why to remove name=Equator?”
If you have an explanation, why OpenStreetMap shouldn’t reflect presence of name=“Equator”? We would like to know, because right now your explanations lead down estimates “your arguments are weak” to personal motives “we don’t”, “we” or even worse.
If you need more time for a good reply, let us know.
You don’t have to worry about it was implemented 3 years ago.
We will use additional tag:
extreme_point_of=earth
Yes, amenity=cafe + name=“North pole” is easily filtered from extreme_point_of=earth + name=“North pole”.
Please don’t ask quite trivial questions, you have 6 years of experience in OSM 

OverQuantum:
- What kind of spatial querying could be based on meridian or circles of latitude objects?
Selecting objects within N meters from Equator. There nothing specific in it compared to other geometries. AFAIK, overpass QL would do as fine with a relation
And while Equator coordinates are trivial (-0 +0 or -180 +180), other Major circles of latitude are more complex.
It is easier to enter “Equator” than “+0, -180; +0, +180” but you seem to deny it at all.

OverQuantum:
- Objects like pole or equator does not exist, they are abstraction coming from lat/lon grid.
OpenStreetMap is a general data provider. http://openstreetmap.org/about
NOT LIMITED TO RENDERING. It was repeated countless times on this forum.
NOT LIMITED TO GEOCODING. It was repeated countless times on this forum.
NOT LIMITED TO A PHYSICAL OBJECTS. Otherwise we will remove good portion of OSM for sake of “invalid geometries”. With exception of few fanatics, nobody cares if Antimeridian was imperfect in shape in OSM.
Yes, we could provide a perfectly shaped Equator geometry with a tag name=“Equator”.
Or an imperfectly shaped geometry with name=Equator + note=“Inaccurate approximation of Equator. Was removed by Frederik Ramm in 2016.” + fixme=“Please study geodesy for 5 years how to use coordinate systems; Use a real GIS system” + wikidata=Q23538
If you would like to redefine core OpenStreetMap priciples, say it explicitly. DON’T limit it just to “these 5 fake lines that could be created simply because I remeember them”
wikidata=* tag was vandalized. “Don’t remove tags that you don’t understand” - still a rule
name=* tag was vandalized. “Don’t remove tags that you don’t understand” - still a rule

OverQuantum:
- Objects like pole or equator does not exist, they are abstraction coming from lat/lon grid.
If there is beacon at (0,0) point we should draw beacon, not “Zero point” locality.
If there is landmark at South Pole we should draw landmark, not pole itself.
Yes, but a physical object isn’t required to enter name=* tag or wikidata=* tag.
I would suggest tag circle_of_latitude=major, without “minor” variants or alternatives. Nobody suggested to enter “49th parallel” or “49.73 parallel” or “0,0001”.
I consider discussion of physical objects is complete off-topic here.
If you would like to discuss it in more detail, prease create a new topic “A non-physical objects in OSM: what to leave or what to keep” - since this topic is way broad than Equator and company.