North Wales beneath the sea

I think, if your standing on the harbour at Aberystwth to get that view over the sea you will be looking North West-ish towards Pwllheli.
 

This appears to be Garn Fadryn, 1217 feet high (mountains in the UK are tiny)
[compare]
Garn Fadryn A.jpg
Garn Fadryn B.jpg
[/compare]

Rough pixel measures show about 48/117 pixel missing so 1217*48/117 = about 500 feet missing. A fraction of 0.41. It's 38 miles away, and 33 feet eye height:

https://www.metabunk.org/curve/?d=38&h=33&r=3959&u=i&a=n&fd=60&fp=3264

Distance = 38 Miles (200640 Feet), View Height = 33 Feet (396 Inches) Radius = 3959 Miles (20903520 Feet)

Results ignoring refraction
Horizon = 7.03 Miles (37143.42 Feet)
Bulge = 240.73 Feet (2888.75 Inches)
Drop = 962.93 Feet (11555.18 Inches)
Hidden= 639.38 Feet (7672.6 Inches)
Horizon Dip = 0.102 Degrees, (0.0018 Radians)


With Standard Refraction 7/6*r, radius = 4618.83 Miles (24387440 Feet)
Refracted Horizon = 7.6 Miles (40119.47 Feet)
Refracted Drop= 825.37 Feet (9904.38 Inches)
Refracted Hidden= 528.28 Feet (6339.3 Inches)
Refracted Dip = 0.094 Degrees, (0.0016 Radians)

Content from External Source
Almost exactly right for standard refraction - so very good viewing conditions.
 
I started making list and was going to get the bearings, but you seem to be on top of it already!

I am fairly sure that you can't see bardsey at all from that sort of position/ elevation, so that seems about right.

Mynydd Rhiw Elevation: 304 m - second photo with TV mast
Carn Fadryn Elevation: 371 m - Mick's no.3
Garn Boduan Elevation: 279 m - no.4?
Yr Eifl Elevation: 564 m photo - no.5?
Moel-y-gest Elevation: 263 m
Gyrn Ddu Elevation: 522 m - no.6?
Craig Cwm Silyn Elevation: 734 m no.7?
Garnedd Goch Elevation: 700 m no.7?

Mynydd Enlli (Bardsey Island) Elevation: 167 m - not visible
 
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