*yes, although Glorantha is a flat lozenge, rather than a globe, it too has a horizon. Let Clement Longhair of the Nochet Lhankor Mhy Temple explain:

ON THE PROPERTIES OF THE ELEMENTS: HOW FAR CAN SOMEONE SEE ON THE OCEAN? 
As is well known Light, like Fire, is a manifestation of Aether and thus properly belongs in the Sky World. The elements always seeks their own proper level in the bubble that is Glorantha, thus light tends to curve upward slightly as it flits along at a great pace. This is why you see the top of a mast as a ship approaches, then the sails, then the body. Some crude drawings may make this more clear: At this stage the light from the mast barely skims the waters, making the top visible, but the path that light from the sails would have to take intersects the ocean's surface and is absorbed by the hungry waters. A little thought reveals this to be the true explanation for the 'horizon' of seafarers and for why the tops of objects are seen first as a distant object approaches. Note also that an observer higher up may see farther, thus we have lookouts atop the masts of ships and observation towers (this phenomenon is seen on land as well but is less obvious.)

As for the counter-arguments by the ignorant, these rest on the principle that light travels in straight lines. Obviously this must be false, as we know that Light is but the subtle form of Fire, which, seeking its proper level, tends to rise. Thus it is insupportable that light should not curve upward in it path. Objections of the Ignorant:

1. That Light descends from the Sun and Stars, invalidating my Claims.

I answer this as follows: beyond the Sky Dome is a Shining World. Of the Shining World's great Light, but a small Fraction descends to us along the paths pioneered by mighty Yelm and his lesser descendants and followers. The Will of these divine Beings is to send light to the mortal world, hence the light descends, against its Nature. However, it always yearns to return unto its true Home. 2. That El-Metal (Gold) falls Down toward the Earth with great Force, against the Tenets of my Theory.

I answer this as follows: Yelm's metal indeed falls down with great Force, but in the oldest records this is not so. In Godtime, before the Darkness, it was the Lightest of Metals and would even Leap and Dance about, from the Yearning of the Fire Within to return to the Sky World. See , and lastly "The Sun Wheel Dancers" by Hector the Wise of Sun County for a compilation of the works of the Ancient Authors I have cited.

Only after the Sunslaying (familiar to all who love the Lightbringer Saga) did Gold become heavy and lifeless, seeking to join the Celestial Emperor in the Underworld. Thus through the actions of Great Orlanth did Gold become the heaviest of Metals. [from the Nochet Collectanea XXIX. 344.88]
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